6.8mm vs. 7.62 mm long range rifle

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Lord Shiva

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May 11, 2008
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Hello all,
I am looking at acquiring a rifle a “long range” rifle for use at ranges from 500M to 900M.
I currently have the following rifles:
• 16” 5.56mm Larue Stealth Sniper
• POF 5.56mm SBR
• Noveske 6.8mm SBR
So here are my questions:
At the ranges I am looking at what are the pros and cons of adding a new caliber (7.62mm) rifle vs. adding a long barrel 6.8mm rifle and being able to share ammunition?
Feedback on:
• 6.8mm vs. 7.62mm at 500M 700M and 900M?
If I add another 6.8mm here are the manufactures I am considering:
• POF - Patriot Ordnance Factory
• LWRC
Any feedback on these, good or bad would be appreciated.
If I add the 7.62mm here are the manufactures I am considering:
• POF - Patriot Ordnance Factory
• LWRC REPR
• Larue OBR
Any feedback on these, good or bad would be appreciated.
Finally, I would like to know what people consider the optimal barrel length for a rifle like this.
Thanks for the feedback.
Mark
 
Interesting first post. Anyway, you will most likely not have any kind of accuracy out of your 6.8 (even with a long barrel) out past 700 yards. They use extremely low BC bullets and they drop like a rock and shed velocity really quick.

If it were me I would be buying the Larue in .308 but in all honesty I don't think that a .308 in the ar 10 platform is the way to go for long range shooting. But if you like the AR so much then LaRue is a good way to go.

You may have better luck getting the range you need from a 6.5 grendel and even less drop. Of course you sacrifice energy by going to a smaller round.
 
Like Longdayjake said, the 6.8 is not a great long distance round. For distance you want a heavy for caliber bullet to help buck wind and keep its momentum in turn velocity up. The 6.8 wont accept the heavy .270 rounds I believe and launches the lighter ones at lower velocities.
 
If you really want good long range performance, look to what the benchrest and F-class people are using: 6.5 mm. Check out a .260 Remington, which is a .308 necked down to .260. 6.8 mm SPC, unfortunately, is a relatively large bullet in a shorter cartridge, which is the recipe for a short range round, not a long range one.
 
I agree with all the above; look for something in grendel, or 6.5 creedmoor, or the 260. I believe there are a few ar makers out there, who make a 260 or a creedmoor, but not sure on the grendel ar. If you could handload the 6.8 with some 140 or heavier bullets, that would be nice, but like mentioned above, I don't know if these longer loads would fit in your envelope.
 
Q: Do you handload?
If so, any of the several 6.5mm cartridges mentioned will do you a good job.
If not, cost and availability favor the 7.62.
 
As for the typical "The 6.8 can't do it" claims from the Grendel lovers...

bsflag.gif

With the right chamber, rifling and rate of twist, and a 20" barrel... it is doable to shoot at those ranges with a 6.8 (contrary to the claims the Grendel lovers tout). I don't believe you'll easily achieve your goal with those makers' offerings though.

The 6.8 SPC is primarily a "carbine" designed round (as is the Grendel), and really shines in the 300yd and under ranges... but is NOT incapable of reaching out to longer ranges. I know of one young man who can/does consistently ring the gong at 800yds with a 20" AR in 6.8 SPC. If you want to do it with a 6.8, I'd look at two vendors in particular... AR Performance and Bison Armory. Harrison (ARP) and Ben (Bison) will have the most up to date performance oriented specs for the 6.8 (chamber, rifling, barrel quality, bolt, etc.).

The attached article is LONG... and the writing style isn't the most "eyeball friendly", but the content is very good information. Meaning... the two rounds (6.8/6.5) are closer in performance than the Grendel clan might have you choose to believe. There's more to it than the hallowed "B.C." that gets chanted.

http://wintersoldier2008.typepad.co...cs-the-65mm-grendel-versus-the-68mm-spc-.html

All that said... unless I was going to take it on as a mission (long range use of the 6.8), as in to prove it to myself... I'd probably opt for the .308 for those chores. Simply because... one is a "carbine" round, the other is a "rifle" round. "Right tool for the job". Besides... a Grendel can't shoot to those ranges if you can't find ammo for it. :D
 
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As much as I like the 6.8 SPC, it is not a long distance shooter. If you just want to punch paper at the limit of your requested range it could, but not as consistantly as something designed for it those distances.

If you want something in the AR-15 platform, consider a 6mmBR, 6mmBRX, or 6.5mmBR. AR Performance is making them, but you will have to call or e-mail. Factory loadings are available but reloading will help.http://ar15performance.com/home

You can also step up to an AR-10 (or AR Performance's lighter 12) and use .308, .260, 7mm08, etc.
 
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The 6.8 SPC is primarily a "carbine" designed round (as is the Grendel), and really shines in the 300yd and under ranges... but is NOT incapable of reaching out to longer ranges. I know of one young man who can/does consistently ring the gong at 800yds with a 20" AR in 6.8 SPC. If you want to do it with a 6.8, I'd look at two vendors in particular... AR Performance and Bison Armory. Harrison (ARP) and Ben (Bison) will have the most up to date performance oriented specs for the 6.8 (chamber, rifling, barrel quality, bolt, etc.).

The attached article is LONG... and the writing style isn't the most "eyeball friendly", but the content is very good information. Meaning... the two rounds (6.8/6.5) are closer in performance than the Grendel clan might have you choose to believe. There's more to it than the hallowed "B.C." that gets chanted.

http://wintersoldier2008.typepad.com...68mm-spc-.html

So you quote a biased article as proof of something? That was probably the worst article I have ever read and I am actually pretty upset at you for posting it. I wasted a lot of time reading it. The man took the worst velocities from a grendel and compared it to the best velocities of the 6.8. Nor did he mention that the grendel is a long range cartride and will benefit most from long barrels. One thing that he did prove was that the 6.8 isn't any better than the Grendel from a 14.5" barrel. Also, did he even specify what barrel length he was comparing to?

NOBODY buys a 14.5" barrel for long range shooting. Especially if you are going to go out to 1000 meters or more. The OP asked about 500-900m. That kind of shooting should be done and is done best with longer barrels. The 6.5 stuff does much much better from longer barrels than you think. Though it is true that the 6.8 does pretty good from short barrels, it really doesn't gain a whole lot from extra barrel length. (Go 6.8!) But when you put a 20-24" barrel on the grendel your velocity goes from 2400 fps (14.5" barrel) up to over 2600 fps (24") with a 123 grain bullet. The 6.8 does not gain much from a longer barrel so it won't be that much faster than the 6.5 with a 24" barrel.

Now, I did not say that the 6.8 can't shoot out that far, just that others can do it better. 99% of the 6.8 loads have such a low BC that they can't even reach 800 yards before they go subsonic. Most bullets need to be going supersonic to maintain stability. Also, the higher BC of the 6.5 bullets will provide a HUGE advantage in both windage and elevation at 800 yards. That and it will also carry much more energy.

Half of what was in that article was wishful thinking. The other half was just long winded. Though its good reading for someone that loves the 6.8 and doesn't want to fact check. That article was actually the first person I have seen try to claim that the 6.8 matches the 6.5 at long range shooting.
 
So you quote a biased article as proof of something? That was probably the worst article I have ever read and I am actually pretty upset at you for posting it. I wasted a lot of time reading it. The man took the worst velocities from a grendel and compared it to the best velocities of the 6.8. Nor did he mention that the grendel is a long range cartride and will benefit most from long barrels. One thing that he did prove was that the 6.8 isn't any better than the Grendel from a 14.5" barrel. Also, did he even specify what barrel length he was comparing to?

NOBODY buys a 14.5" barrel for long range shooting. Especially if you are going to go out to 1000 meters or more. The OP asked about 500-900m. That kind of shooting should be done and is done best with longer barrels. The 6.5 stuff does much much better from longer barrels than you think. Though it is true that the 6.8 does pretty good from short barrels, it really doesn't gain a whole lot from extra barrel length. (Go 6.8!) But when you put a 20-24" barrel on the grendel your velocity goes from 2400 fps (14.5" barrel) up to over 2600 fps (24") with a 123 grain bullet. The 6.8 does not gain much from a longer barrel so it won't be that much faster than the 6.5 with a 24" barrel.

Now, I did not say that the 6.8 can't shoot out that far, just that others can do it better. 99% of the 6.8 loads have such a low BC that they can't even reach 800 yards before they go subsonic. Most bullets need to be going supersonic to maintain stability. Also, the higher BC of the 6.5 bullets will provide a HUGE advantage in both windage and elevation at 800 yards. That and it will also carry much more energy.

Half of what was in that article was wishful thinking. The other half was just long winded. Though its good reading for someone that loves the 6.8 and doesn't want to fact check. That article was actually the first person I have seen try to claim that the 6.8 matches the 6.5 at long range shooting.
And, lemme guess... anything you post against a 6.8 and FOR a 6.5 isn't going to be biased (as you accuse)?

Your love of the 6.5 doesn't make it any less a carbine round... nor does it prove it superior to the 6.8.

Unless you missed it in the OP... he didn't ask about your beloved Grendel round. He asked about the 6.8 and the 7.62 (I assumed he was talking 7.62 NATO). But, instead of addressing his questions... he's force fed the typical trash talk against the 6.8 by the Grendel lovers.

Nobody (BTW) insisted that you go read the entire article... and, I DID give fair warning that it was long and not too easy on the eyes. But, since it does not chant the glories of the Grendel... it's biased and worthy of only dismissal. (Yeah) So... if you don't like the fact that I included the link... go sit in the corner with your lower lip hanging out and grumble to yourself. I don't need your permission to share a link.

Face the facts, the 6.8 has a greater following than does the Grendel... and, like I mentioned earlier... the Grendel isn't going to shoot 800yds if you can't find ammo to feed it. I also stated that these carbine calibers are better suited for 300 (or less) yds, and that for the longer ranges, a feller's better off to go to a RIFLE caliber.
 
But, instead of addressing his questions... he's force fed the typical trash talk against the 6.8 by the Grendel lovers.

Where was he force fed trash talk? Please quote.

And, lemme guess... anything you post against a 6.8 and FOR a 6.5 isn't going to be biased (as you accuse)?

No it isn't. I use real data provided by real companies. The person that wrote that article MADE UP STUFF. Also, its not an accusation if you can prove it. And I can prove it!

like I mentioned earlier... the Grendel isn't going to shoot 800yds if you can't find ammo to feed it.

Thats not an issue with the grendel. There are plenty of places you can get Grendel ammo RIGHT NOW. In fact, the store I shop at has 6.5 hornady but not a single round of 6.8 anywhere. Reloading components are easier to find for the grendel anyway since 7.62x39 brass can be used so thats a moot point and poor argument.

Nobody (BTW) insisted that you go read the entire article... and, I DID give fair warning that it was long and not too easy on the eyes. But, since it does not chant the glories of the Grendel... it's biased and worthy of only dismissal. (Yeah) So... if you don't like the fact that I included the link... go sit in the corner with your lower lip hanging out and grumble to yourself.

I'm not upset that you shared a link. In fact I was excited to read something that may offer a really good 6.8 long range load. I was upset upon reading the article that it contained a HUGE bias and false information. It makes you look foolish when you post it as "proof" that the 6.8 can match the 6.5 at long range.



Okay, now my turn to PROVE that the article was biased. I will do this by quoting HIS OWN WORDS. (they will appear in puke-green).

alexander arms, one of the chief developers of the 6.5mm grendel, lists a factory loading using the 123 grain sierra hpbt (a/k/a “matchking”) as 2475 fps.

Alexander actually lists a lapua scenar as 2480 fps from a 16" barrel but no big deal.

at its website, alexander arms describes a factory load using the same 115 grain hpbt bullet (a/k/a “matchking”) at 2525 fps

i will simply assert that it is reasonable to say that the 6.8mm remington will generate around 2600 fps from a 115 grain bullet, without undue pressure.

So, he says 2475 for grendel. Then he says 2525 for 6.8. Then he says he thinks 2600 is reasonable. Okay I can accept that. I believe that the 6.8 can be loaded to shoot 2600 with a 115 grain bullet and 16" barrel. But here comes the part that is horribly biased.

ballistic co-efficient:.320-.329 -- 6.8mm (.277”) 115 grain bullet, at 2600 fps

compared to

ballistic co-efficient: .510- .519 -- 6.5 grendel (.264”) 123 grain bullet, at 2400 fps

So, somehow the grendel loses 75 fps? Tell me how thats not biased or an unfair comparisson.


What do I think would be fair? Compare Alexander Arms data to SSA data. the 123 lapua scenar from the grendel is listed at 2480 fps and the 115 grain OTM ssa tactical load (also a match bullet) is listed at 2575 fps.

My guess is that you will get a different result than the article gave.

I am out of time but if you really want I can post more problems with the article at a later time.
 
A handloaded 6.5g outperforms a 6.8spc at longer ranges. 6.5g can even exceed 7.62 in rare circumstances. But it certainly at least keeps up well. The 6.5g is the perfect round for a long barreled SPR type Ar15.

But the 6.8 is getting all the Hot ammo lately. the 6.5 is falling a bit behind as far as ammo you can buy off a shelf somewhere. And the 6.8 can reach out as far as a 6.5g, it just deosn't do it as well.

The 6.8 is a tactical oriented round. Made for short 14.5 and 16" barrels first. It's a good attempt to make a more powerful 5.56.

Comparing lightweight carbines to heavy 7.62 battle rifles is a bit unfair. Sure the 7.62 is better suited for long range, but tou can't squeeze it into a light carbine.


7.62 if you don't mind a heavy gun, and are truely after long range. The LMT .308 and Larue OBR get my usual plug for this caliber. Too heavy/slow for a defensive weapon IMO.

6.8 if you want a powerful carbine with a shorter barrel and don't mind spending extra for ammo and rifle. Or if you just want more than 5.56. Rainier Arms, Bison Arms make good 6.8 uppers.

6.5 if your going to handload or can locate proper target ammo. Very expensive, may not feed as well as 6.8 so it may have less of a defensive role. Needs a longer barrel. 6.5 is a one trick pony, better for SPR type builds, not carbines.

5.56- don't underestimate the 5.56 SPR's like the BCM Mk12, larue OBR Lite. The heavy 70+ gn rounds are quite accurate, and should be effective out to 700. Maybe not as much as 6.8 or 6.5, but they get the job done. At closer ranges, say 400, it may have an advantage, less recoil.
 
There is absolutely no doubt that 6.5 Grendel will handle 500-900 yard range shootin' better than the 6.8SPC, due to the better selection of usable 6.5mm low drag bullets. The 6.8SPC case is optimized for 0-300 yard usage, and uses a relatively long body that doesn't allow the use of long-ogive LD bullet designs. The 6.5 Grendel took the opposite approach, and really shines relative to the 6.8 when the distances get seriously long.

The fact that I have multiple 6.8SPCs and zero 6.5 Grendels doesn't mean that I'm going to feel the need to elevate my 6.8SPC above the 6.5 Grendel. It means that I selected a chambering based on my needs (0-300 yards) and not on other needs. If somebody else wants 500-900 yard performance from an AR15 platform, then 6.5 Grendel is a more viable option than 6.8SPC.

It should also be noted that there are all sorts of other 6mm-6.5mm chamberings designed to facilitate accurate long range shooting from an AR15 platform, but I know very little about them.

In the AR10 platform (7.62x51 action), the 260 seems to be all the rage for LD shooting, also due to its ability to use those very low drag 6.5mm bullets. Of course, the 260 will outperform the 6.5 Grendel, since the round has a much greater case capacity.
 
if all you want is to ring gongs or punch paper, the 5.56 will reach 900m for a lot less money than the other two. yeah, you have to pay attention to the wind a little more, but that just makes it more educational

if you want to be competitive in any long range discipline, i'd say, none of the above on the calibers you mentioned
 
With this, I'm done with the matter with you in this thread.

I'm not going to be dragged into a five or six page blathering of 6.8 vs 6.5 emotional ranting. The OP asked about 6.8 or 7.62. Allow him his topic parameters... fair enough?

Where was he force fed trash talk? Please quote. "Anyway, you will most likely not have any kind of accuracy out of your 6.8 (even with a long barrel) out past 700 yards. They use extremely low BC bullets and they drop like a rock and shed velocity really quick."
Your first post started in with verse #1 of the grendel chant.



No it isn't. I use real data provided by real companies. The person that wrote that article MADE UP STUFF. Also, its not an accusation if you can prove it. And I can prove it! The gist of his point was to compare apples to apples, rather than the typical "grendel lover" ploy of comparing "best case" from a grendel point of view and "worse case" from a 6.8 point of view. MY point was to offer it (as presented) as a means to be fair when doing a comparison. There's more to it than what the grendel lovers want to tout. If you want to get all tied up about it... well... be my guest.



Thats not an issue with the grendel. There are plenty of places you can get Grendel ammo RIGHT NOW. In fact, the store I shop at has 6.5 hornady but not a single round of 6.8 anywhere. Reloading components are easier to find for the grendel anyway since 7.62x39 brass can be used so thats a moot point and poor argument. Hmmm... the biggest complaint I've heard when reading on grendel forums is the lack of ammo. I have yet to see any grendel ammo on the shelves where I am. And... I offered it with a bit of sarcasm too... which apparently wasn't caught on your end.



I'm not upset that you shared a link. In fact I was excited to read something that may offer a really good 6.8 long range load. I was upset upon reading the article that it contained a HUGE bias and false information. It makes you look foolish when you post it as "proof" that the 6.8 can match the 6.5 at long range. If you're genuinely interested in learning something about the 6.8 that isn't based on the "canned grendel chants"... go hang out and ask sincere questions to the guys at the 68forums. Instead... (as usual)... if it isn't offering up the preferred "grendel kool-aid"... it's "biased and false"... blah blah blah.



Okay, now my turn to PROVE that the article was biased. I will do this by quoting HIS OWN WORDS. (they will appear in puke-green).

alexander arms, one of the chief developers of the 6.5mm grendel, lists a factory loading using the 123 grain sierra hpbt (a/k/a “matchking”) as 2475 fps.

Alexander actually lists a lapua scenar as 2480 fps from a 16" barrel but no big deal.

at its website, alexander arms describes a factory load using the same 115 grain hpbt bullet (a/k/a “matchking”) at 2525 fps

i will simply assert that it is reasonable to say that the 6.8mm remington will generate around 2600 fps from a 115 grain bullet, without undue pressure.

So, he says 2475 for grendel. Then he says 2525 for 6.8. Then he says he thinks 2600 is reasonable. Okay I can accept that. I believe that the 6.8 can be loaded to shoot 2600 with a 115 grain bullet and 16" barrel. But here comes the part that is horribly biased.

ballistic co-efficient:.320-.329 -- 6.8mm (.277”) 115 grain bullet, at 2600 fps

compared to

ballistic co-efficient: .510- .519 -- 6.5 grendel (.264”) 123 grain bullet, at 2400 fps

So, somehow the grendel loses 75 fps? Tell me how thats not biased or an unfair comparisson.


What do I think would be fair? Compare Alexander Arms data to SSA data. the 123 lapua scenar from the grendel is listed at 2480 fps and the 115 grain OTM ssa tactical load (also a match bullet) is listed at 2575 fps. Since you ask... set up the two in like configurations, loaded similarly and compare them. Record each one's strengths and weaknesses for a given parameter... then look at it objectively. (BTW... a loss of 75 fps due to a particular rifle's chamber, rate of twist, rifling type, etc. is not beyond the grasp of real world results. Again... agendas come into play with the gathering of data) THEN... let each camp present their "best" configuration/loads and record each one's strengths/weaknesses again. Then, go choose for yourself which one puts a grin on YOUR face. Instead... there's this continual attempt to go piss on someone else's preferences with an aire of superiority... just like what goes on around here between the "glock lovers" and the "1911 lovers". Your "compare load to load" as your dogma is only PART of the tale (which is what the author of that article was trying to communicate). There's chamber design, type of rifling, rate of twist, barrel length, as well as the "load" (And, how the load is prepped/assembled).

My guess is that you will get a different result than the article gave.

I am out of time but if you really want I can post more problems with the article at a later time.And, again, since you asked, no, I'm no more interested in your other verses of the "grendel chant" than I was was to begin with. So, save it for someone who is interested.
 
if all you want is to ring gongs or punch paper, the 5.56 will reach 900m for a lot less money than the other two. yeah, you have to pay attention to the wind a little more, but that just makes it more educational

if you want to be competitive in any long range discipline, i'd say, none of the above on the calibers you mentioned
Bingo. I used to think 600 yards was long range. Then I moved to Colorado.

.260 or 7WSM are what have been recommended to me by Zak Smith and many other experienced long range shooters. If you reload, either are good rounds. If not, the 6.5 Creedmore seems like the best way to go.
 
Hello all,
I am looking at acquiring a rifle a “long range” rifle for use at ranges from 500M to 900M.
I currently have the following rifles:
• 16” 5.56mm Larue Stealth Sniper
• POF 5.56mm SBR
• Noveske 6.8mm SBR
So here are my questions:
At the ranges I am looking at what are the pros and cons of adding a new caliber (7.62mm) rifle vs. adding a long barrel 6.8mm rifle and being able to share ammunition?
Feedback on:
• 6.8mm vs. 7.62mm at 500M 700M and 900M?
If I add another 6.8mm here are the manufactures I am considering:
• POF - Patriot Ordnance Factory
• LWRC
Any feedback on these, good or bad would be appreciated.
If I add the 7.62mm here are the manufactures I am considering:
• POF - Patriot Ordnance Factory
• LWRC REPR
• Larue OBR
Any feedback on these, good or bad would be appreciated.
Finally, I would like to know what people consider the optimal barrel length for a rifle like this.
Thanks for the feedback.
Mark
I would go with a 6.5 for the distances you want.
Find someone you can build the gun the way you want it. Start with a high quality upper and lower. Of course a great trigger is important as well.
Use barrels of high quality that LR competitors use: Kreiger, Brux, Broughton, etc...
Decide if you want to go with the AR-15 platform or the next step up.
Can 6.8 get there-Yes, but so can a lot of other cartridges.
Use a set-up that is regularly used by people who shoot and compete at those distances.
Ernie
 
taliv said:
if all you want is to ring gongs or punch paper, the 5.56 will reach 900m for a lot less money than the other two. yeah, you have to pay attention to the wind a little more, but that just makes it more educational

if you want to be competitive in any long range discipline, i'd say, none of the above on the calibers you mentioned

Lord Shiva hasn't specified what he wants to do with the rifle and this is a problem. All of his choices are semi-autos so what exactly are his plans with this thing?!! I'm not convinced that competitive shooting is on the list ... or hunting even. :scrutiny:

Lord Shiva said:
If I add the 7.62mm here are the manufactures I am considering:
• POF - Patriot Ordnance Factory
• LWRC REPR
• Larue OBR
Any feedback on these, good or bad would be appreciated.

I almost forgot, I have a POF P-308 which is a great "battle" rifle for sure. I'll be shooting a friend's LWRC REPR next Friday and another friend has a LaRue OBR and has no complaints ... the thing is ACCURATE.

:)
 
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6.8mm vs. 7.62 mm long range rifle
/\ /\ /\ /\ /\
Where the heck is 6.5 mentioned anywhere here? But whatever.
For what you want to do, either punching paper or taking game, I suggest an M1A rifle or a good bolt gun in .308. For a bolt gun within my budget I'd go for the Tikka Lite rifle. I just am not very enthused by any current production "American" bolt gun makers anymore.
The .308 is a great round and can do just about anything you could ask a rifle to do.
 
Get ready...ima boutta piss some people off. :D The .223Rem. with a fast twist is a better long range cartridge than the 6.8SPC (either variant), it just can't handle bullets that are capable of the efficiency needed to reach out there. The .223Rem. is, the 6.5Grendel is even better, the .260Rem. better yet (but also heavier and more costly when chambered in a AR platform because it requires an AR-10 action length). If you are not a reloader, and don't plan to start, pick up a long heavy barreled AR-15 with a fast twist (1:8in. minimum, 1:7 or 6.5" preferred) and get started; if you plan to reload decide what you want (is 900yds. the max., is weight a concern, what about price?) and look for a 6.5Grendel or .260Rem. A 7mm-08Rem. is another option, but it offers no advantage over the .260Rem. and has greater recoil. Additionally there is the .243Win. which affords similar ballistics to the .260Rem. with greater availability, however it has a shorter barrel life and is less suitable for hunting large game (if this is a concern). The .308Win. (7.62NATO) is another option, but IMO is only beneficial if you don't want to reload and want to use the rifle for large game hunting.

As far as the rifle, I am of little assistance, but as much as it pains me to say this, I would choose a DGI rifle over a GP due to the greater potential accuracy in the AR platform.

:)
 
Then why not buy an FN SCAR 17S when they're readily available. You could have .308 Win, 7mm-08 Rem and .260 Rem barrels in a number of different lengths ... eventually.

Mav, don't get me started in a big argument about gas pistons and accuracy. My POFs are plenty accurate. If you want ultimate accuracy, get a bolt gun. If you want a higher rate of fire with acceptable accuracy get a semi-auto ... and I could care less which brand.

:)
 
Mav, don't get me started in a big argument about gas pistons and accuracy. My POFs are plenty accurate. If you want ultimate accuracy, get a bolt gun. If you want a higher rate of fire with acceptable accuracy get a semi-auto ... and I could care less which brand.
I have no experience with POFs and only limited experience with other GP AR platform rifles. They exhibited average accuracy, but not what I would consider acceptable for a long range rifle, however I don't claim to be no expert on the AR platform. My evidence may be misleading and simply a factor of the components used. I completely agree that the bolt action rifle is the premier long range precision rifle, and is likely to claim that top spot for many years to come.

:)
 
If you have your heart set on an AR platform for long range shooting you may want to consider a 243 cal. with a 1/7.5 twist. This will let you shoot the heavy 115 DTAC's with great accuracy which can outperform a 7.62. The drawback to this caliber is barrel life which depending on the rounds fired it is only good for about 3000 to 4000 rds. maybe less.
 
I know you said you were done, but I just want to defend my position a little. Don't feel obligated to respond.

I didn't join this thread to spout Grendel koolaid. I joined it to help answer the question. What I said was true. The 6.8 does indeed drop like a rock past 700 yards and is not by any means a long range cartridge. You were the one that came in and said that the Grendel's long range superiority was B.S. Everything that I stated was true. I was just trying to be helpful. Here is some data that may help to illustrate why I said that the grendel may be better for long range shooting.

.308 175 grain sierra match king M118 shot at about 2600 fps (24" barrel velocities) BC of .505

sighted in at 100 yards.

500 yards Velocity= 1825 Impact= -68.71 Energy= 1294
700 yards Velocity= 1566 Impact= -160.88 Energy= 953
900 yards Velocity= 1253 Impact= -309.99 Energy= 703

6.8 SPC II with 115 grain OTM shot at approx 2800 (SAA data) BC of .317 (best guess of 24" barrel velocities) SSA lists it as having 2575 from 16" barrel so I gave it about 28 fps for each inch of barrel which I think is generous.

500 yards Velocity= 1580 Impact= -71.01 Energy= 637
700 yards Velocity= 1243 Impact= -180.89 Energy= 395
900 yards Velocity= 1041 Impact= -404.24 Energy= 277

6.5 Grendel with 123 grain Lapua Scenar shot at 2620 (AA data from 24" barrels) BC of .547

500 yards Velocity= 1896 Impact= -66.02 Energy= 982
700 yards Velocity= 1649 Impact= -152.94 Energy= 743
900 yards Velocity= 1431 Impact= -291.24 Energy= 559

When I said that the Grendel would probably be better for longer range I wasn't lying. The .308 beats the Grendel pretty handily in energy but as you can see once you get out there the Grendel actually flies flatter and faster than the 175 grain .308 bullet. The .308 is better at killing whereas the 6.5 is better at punching holes in paper.

The match bullet from the 6.8 drops off pretty darn fast past 700 yards like I mentioned. Even with a generous 200 fps head start.

I don't hate the 6.8. I love the 6.8. But no matter how you look at it, it just won't match the Grendel at longer range. It would be a massive headache and waste of money to try and build a 6.8 as a dedicated long range rifle.

I know you hate it when someone brings up the 6.5 but when talking about long range shooting it sure has its merits and is worth mentioning. Sorry if my attempt to be helpful hurt anyone's feelings. I assure you that wasn't my intention.
 
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