.308 long range

[ArchAngelCD]

I checked the loading data for 308 and 30-06 and the max velocity is about 2700 ft/sec. How do you get the 2800 ft/sec velocity? Moreover, Shooters, my ballistic software gives a .447 BC while midwayusa gives a .504...

But even with the lesser numbers, the drop is 211 compared to 237 at 800 yards. That is a click potential of 120 more yards with my scope without to have to buy a 20 MOA mount.

I have no idea what Hodgdon data you are looking at but I see much higher velocities that that. With a 24" test barrel they are showing much higher velocities than you said... In the 30-06 with a 155gr bullet Hodgdon is showing 5 loads over 3,000 fps and 10 loads over 2,900 fps, some well over 2,900 fps. The 168gr loads are also higher with 2 loads over 2,900 fps and 9 loads over 2,800 fps with a few of them just a hair under 2,900 fps.

When I load a 168gr SMK in a 30-06 case with a powder charge a full grain below the Max on the Hodgdon site my M1917 w/26" barrel will deliver an AV of 2,880 fps and sometimes higher depending upon the weather.

BTW, if you want correct BC numbers for Sierra match bullets check the Sierra site. They give a sliding scale of BC numbers according to the velocities. Hornady does similar for their match bullets but without the sliding scale.

 

[kestak]

It was the 308 data, not the 30-06 I did look at.

I also did a lot of reading after a friend PM me a website: http://riflemansjournal.blogspot.com/

I read with great attention the Palma section where he explains the what and why of reloading for 308 to shoot 1000 yards. I knew much of that stuff (not as much as he described) but I did not give it as much attention as I should.

I do not neck turn.
I do not check my cases for capacity. (I just go with head stamps).
I based my COAL more so it fits the magazine than really the jump.
I do not check the concentric.
And I weight to .1 and not .01 (or .05 I do not remember at this early time).

Moreover, as good as I think I am, I do not shoot from a completely supported position (I practice dry firing 20 minutes per day and my NPOA is as good as it will ever get, and I always shoot in rifleman cadence when more than one shot), my trigger is not a air trigger (stock LMT trigger) either.

I came to the Nobel worthy conclusion (pun intended,those who are really free know what Nobel prize is all about) that all those factors put together will compound and they will begin to show at 600+.

Thank you

 

[jwrowland77]

I don't neck turn either, or check case capacity. Shooting 190's at 600, and 170's at 1000.

A big part of it is the man/woman behind the gun. Learning to read wind is a huge factor when shooting mid-range/long-range. Making the right wind call is paramount.

Yes you need the load to get you there, but at 1000, you make the wrong wind call, and you'll be off the paper (65"x65" target). I saw it several times from Experts making bad wind calls just a few weeks ago when the wind was all over the place.

 

[spitballer]

What about the wind impact difference? Does the higher BC compensate for the lesser weight? My 223 when it is windy is hell to shoot pass 300 yards....

My .223 is also stymied by wind and I'm still trying to get my mind around this concept. I agree with USSR's comment about hang time but the inertia of a heavier projectile obviously accounts for something.