6.5 Grendel vs. .243 Winchester - hmmm

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Does anyone chamber anything in 7x39? That would be sweet.

Looks to be custom rifle chamber only.
Not that I could ever find, but I've thought about having a barrel made for one of my Mini's and some custom dies. But I'm not one to pour money down a hobby rathole either. This 6.5 Grendel is proving to be a real shooter, and deadly on game, so as much as I'd love to lob 140 grain 7mm bullets at 2400 fps, my 123 grain 6.5's at 2500 will have to do for now.
 
Just to resurrect this thread for an update...

I was intrigued by the new Sierra bullet - the 130-grain GameChanger in 6.5 - and wanted to see what it would do out of the Grendel.

Yesterday I was able to perform a ladder test and some initial accuracy testing. I was pleasantly surprised to learn that pressure signs didn't begin to appear until I reached the max published load for 123's on Hodgdon's website (28.5 grains of 8208, which resulted in 2550 fps). I backed off 0.5 grains to 28 (2500 fps), which is also the accuracy node for my 123 SST's and 120 NBT's (which also travel 2500 fps. despite being 7 and 10 grains lighter, respectively).

28 grains of 8208 XBR resulted in 2500 fps. with the 130 GameChangers, and a tidy 3/4" group at 100 yards. Now I will go back a few more times with 5-shot groups and 300 yard groups to confirm my initial tests, but things do look promising.

I'm a fam of heavy for caliber, tougher bullets for hunting applications and this 130 GameChanger might just be all that for the Grendel. According to the Hornady ballistics chart, the bullet will still carry 1000 ft. lbs. of energy at 400 yards. Not that I plan to take a 400-yard shot at a whitetail, but I probably would on a pig if the opportunity arose.
 
Just to resurrect this thread for an update...

I was intrigued by the new Sierra bullet - the 130-grain GameChanger in 6.5 - and wanted to see what it would do out of the Grendel.

Yesterday I was able to perform a ladder test and some initial accuracy testing. I was pleasantly surprised to learn that pressure signs didn't begin to appear until I reached the max published load for 123's on Hodgdon's website (28.5 grains of 8208, which resulted in 2550 fps). I backed off 0.5 grains to 28 (2500 fps), which is also the accuracy node for my 123 SST's and 120 NBT's (which also travel 2500 fps. despite being 7 and 10 grains lighter, respectively).

28 grains of 8208 XBR resulted in 2500 fps. with the 130 GameChangers, and a tidy 3/4" group at 100 yards. Now I will go back a few more times with 5-shot groups and 300 yard groups to confirm my initial tests, but things do look promising.

I'm a fam of heavy for caliber, tougher bullets for hunting applications and this 130 GameChanger might just be all that for the Grendel. According to the Hornady ballistics chart, the bullet will still carry 1000 ft. lbs. of energy at 400 yards. Not that I plan to take a 400-yard shot at a whitetail, but I probably would on a pig if the opportunity arose.

Thats impressive. I have a 6.5 grendel bolt sitting on the shelf in my shed and a spare upper. I might just have to pick up a barrel.
 
I'll continue to update as I have range time. I'm very satisfied with the 123 SST's both on paper and so far on game. If I had to swear to it, the 120 Nosler Ballistic Tips are probably just a "hair" more accurate in my testing, but it's so close it's probably a wash and I have always preferred the SST's performance on game vs. the Ballistic Tips anyway.

If the trend continues with the Sierra 130's, this will be my bullet of choice for the Grendel. Provided that is, the terminal performance lives up to the billing. Sierra says the GameChanger's jacket is thicker than the Match Kings and it should hold up better. One never knows however until the "bullet hits the bone" so to speak.

But at least on paper, so far, this sure looks like a potent little round for deer and pigs in a lighweight, accurate rifle.

I upgraded the scope yesterday from the Nikko Panamax package scope to a Leupold 3-9x40, which saved me another 4 oz. on weight. So the whole rig weighs in at 6 lbs. 12 oz., ready to hunt.
 
My load for 120 BTs is also 28 grains of 8208. I’m looking forward to the results. I took a doe with that load in October and the Nosler worked very well. I’ve never tried SSTs in my Grendel.
 
Another range report from today... I just about shot up that pretty box of ammo. It was raining pretty good however and I have no idea how much that affects things at 300 yards, but it's all I had to work with. :D

123 SST's continue to impress on the range with a VERY tidy 1.7" 4-shot group at 300 yards, dead center first shot (which is always so encouraging from a hunting rifle!).

130 Sierra Gamechangers were no slouch at 2.5" 4-shot group at 300 yards, but I feel like they can do better. I shot them 2nd so the barrel was warmer which might have had something to do with it - although I did my best to give the barrel time to cool (about 10 min.) between groups.

The 5th round of each went on to the 100 yard paper to help me calculate drop. In both cases, the drop was too close to call. Right at 5 MOA from 100 to 300 yards, which is consistent with the data from the Hornady ballistic calculator for a 0.51 BC projectile leaving the muzzle at 2500 fps.

This 6.5 Grendel Howa Mini is one accurate rifle. The ballistic reticle on my Leupold American Marksman matches up very well too, with a 100 yard zero the 1st dot is 200 and 2nd is 300 almost exactly.

Next test will be on live critters. I'm hoping to shoot at least 2 deer and 2 or 3 pigs with the Sierras to see how they do. I've already shot 2 coyotes and 2 pigs with the SST's, and not one of them took a step. The exit holes were all about 1/2 dollar size.
 
To me the hands down winner is 243 Win. I hunt open country so extending point blank range is important. Especially if coyotes are on the docket. And 243 has good SD and power for plains game.
You won't ever see a bunch of ranchers giving up their 243's for grendels any time soon.
 
To me the hands down winner is 243 Win. I hunt open country so extending point blank range is important. Especially if coyotes are on the docket. And 243 has good SD and power for plains game.
You won't ever see a bunch of ranchers giving up their 243's for grendels any time soon.
Interesting opinion. Can you back that up with numbers to help me understand the reasoning?
 
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5 inch not moa drop at 300 yds, 2500+fps at 400 yds not at the muzzle, not going transsonic till 1400ish yds, and 899 ft lbs at 700 yds for the energy suckers. 1800 fps velocity window doesn't get crossed till 950, and if you zero at 250, there isn't even a need for holdover till 350 as long as the critter is larger than a skunk. When you can see farther, the coyotes can see you from farther away too, and while it happens occasionally, most of my yotes have been dropped on the back side of 300, not on the near side, again I'm not anti Grendel, but let's not pretend it's something it's not. A 90 tgk @3150 is as much of a game changer for the .243 as the 130 is for the Grendel @2500. If we need more s.d. for heavier game there's bullets for that, as well as monometals, but the .243 was coined "mild but wild" for a reason, I'll run a Grendel one day (probably in about 2 years) but I'll never give up a throttled 6mm, the only true replacement for a .243 in my stable will be a fast twist 6-.284.
 
5 inch not moa drop at 300 yds, 2500+fps at 400 yds not at the muzzle, not going transsonic till 1400ish yds, and 899 ft lbs at 700 yds for the energy suckers. 1800 fps velocity window doesn't get crossed till 950, and if you zero at 250, there isn't even a need for holdover till 350 as long as the critter is larger than a skunk. When you can see farther, the coyotes can see you from farther away too, and while it happens occasionally, most of my yotes have been dropped on the back side of 300, not on the near side, again I'm not anti Grendel, but let's not pretend it's something it's not. A 90 tgk @3150 is as much of a game changer for the .243 as the 130 is for the Grendel @2500. If we need more s.d. for heavier game there's bullets for that, as well as monometals, but the .243 was coined "mild but wild" for a reason, I'll run a Grendel one day (probably in about 2 years) but I'll never give up a throttled 6mm, the only true replacement for a .243 in my stable will be a fast twist 6-.284.

Fair enough!

The .243 will always be flatter shooting. But for us "heavy bullet" fans, it will also always be lacking in that area. ;)
 
It's still plenty heavy for the plains game, as stated, and if it's true weight, then neither the Grendel nor the .243 will be present.
Maybe it's just me but I still can't get my head wrapped around a 100 grain bullet.

I know the .243 kills way above it's weight class though.
 
Maybe it's just me but I still can't get my head wrapped around a 100 grain bullet.

I know the .243 kills way above it's weight class though.
Lol the number of times I've heard that, you reference a 120 btip? At 2500? (S.d. .264) it works well enough yes? 105 vld hunting berger =.264 ;). 7.62x39 takes plenty of deer and hogs with 123s (s.d. .183) (smaller than a .243 85 gr .206). Weight starts counting more with diameters that rely on frontal diameter more than velocity opening a cavity, I.e. .357, .44, .41, .45 etc. Otherwise, bullet construction, appropriate velocities, and sectional density make a bigger difference than sheer weight. It's been a LONG time since I relied on weight and energy to do the killing, and if I were crossing the Atlantic I might again, but it turns out, thanks to modern bullets, that mentality isn't necessary for clean ethical kills from accurate shot placement. There's a thread in hunting about a .300 Wm 165 partition failing at 40 yds, my wife's buck, and my buddy's doe were shot at almost identical distances, he was running .270 134 bxrs on a hard quartering to shot at 30ish yds, she was running 6mm prohunters at 40 ish yd, hard quartering to, he had no exit, bloodshot decimation on the entering quater, bone shards scattered through the chest cavity, .5 heart and .25 lung recovered, and a good chuckle about long range bullets at close range, doe ran flat 20 yds into the death plowcircle. She had a full exit out the far ham, half a heart, and .25 of a lung, and yup, bone shards through the chest cavity, buck death bucked (muley) 20 yds and plowed over. I'd bet that at 40 yds the 123 sst would have similar results on a similar shot presentation. There'll be less recoil for sure, but that's moot for killing power. Plains game just doesn't take much killing. I've never been charged by a buffalo (not bison) nor rhino nor elephant nor brown bear whilst stalking pronghorn and bambis, and the coyotes just CAN'T get "out of range" if you can still see em lol. On different terrain, or with different game, the hot 6.5s and 08 class 7s and 30s+ come into their own but a 123 is plenty in a 6.5, too small in a .30-06 for a reason ;).
 
The closer comparison is the 243 vs the 6mm Creedmore as they are the same diameter with both the 6mm & 6.5 CM use the same basic case.
 
130 GameChangers aren't off to a good start. LOL 3 pigs this evening and they all ran farther than I'm used to seeing them run with the 123 SST's. Small sample size, I know, but "thankfully?" we have a lot more pigs where those came from, so I'll just have to keep testing. ;)

The concern with the GameChangers is that they wouldn't expand enough due to the heavy jacket. That's what I'm hoping to determine.
 
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