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.375 GSC 414 VS CEB 425 at 2050 yards

 
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  #8  
Old 07-31-2013, 07:23 AM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Yrcan

You must be shooting a 338/408 or similar cartridge to reach 1010m/sec and use 103 gr. VV570 as your load. You must be using the newer 300 gr. Bergers, as the older lots would not tolerate those velocities. The good news is the newer Berger 300s transition very accurately (as Broz and others can attest)

I agree that the bullets were stable if you could get them to group at all at 1,000 meters. From my experience if they are marginally stable they will group at your 690 meter distance, but will not group at all at 1,000 meters. The low hits at 1,000 meters were most likely telling you the bc was than expected.

My experience with 338 caliber solids tells me that your inability to see hits at all at 2200 meters relates to the projectile having a lower than expected BC and not transitioning well as it went subsonic before it got to 2200 meters.

Jeffvn
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  #9  
Old 07-31-2013, 10:24 AM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

I shoot a standard 338LM, with a Lothar Walter 32" barrel.
The 300 grs Berger OTM has a MV of 890 m/sec using 93 grs of 570. The 267 grs GSC bullet was chronoed using 2 different chronographs, and the was correct at 690 meters, and maybe 3 moa low at 1000 meters. I did this test in december last year, so I do not remember exactly. But the loads and MV I remember.

I shoot a 250 grs Scenar using also 103 grs of 570, at 1020 m/sec. It is a very hot load, and brass life was short, using Lapua brass. My standard load is 98 grs of 570, which gives me 990 m/sec with the 250 grs.

We are heading off to shoot at 2000 meters this weekend, I will shoot both my 338LM and my 300WM, will post video of it.
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  #10  
Old 07-31-2013, 01:50 PM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Quote:
Originally Posted by Yrcan View Post
Great video.

I have been shooting 267 grs GSC bullets i my 338LM, they look the same as the ones used here.
I found the advertised BC to be very high. I used 103 grs of Viht N570 powder, and MV was 1010 m/sec. At 100 meters they grouped fantastic, and also at 690 meters. But at 1000 meters, they started do hit way low, and at 2200 meters, they did not even connect with the target, being a frozen waterfall, 60 meters high and 20 meters wide. I shot some 300 grs Bergers to see if something was off, but they hit the ice wall where they where supposed to.

I might not have enough twistrate to stabilize theese bullets, but since they grouped well at 690 and 1000 meters, just hitting low, I think the high MV replaces the lack of twist.

I get my 375 CT soon, so I will follow this thread with great interest, in my search for bullets

The 250 & 300 Begers certainly perform well in the 338s.

Have a look at the CE projectiles for your 375, don't be put off by realistic BCs, the ones I have tried have been pretty close or spot on to advertised one.

There is something about shooting ELR, ie past a mile, it gets quite addictive
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  #11  
Old 08-08-2013, 01:26 PM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Quote:
Originally Posted by JeffVN View Post
Yrcan

You must be shooting a 338/408 or similar cartridge to reach 1010m/sec and use 103 gr. VV570 as your load. You must be using the newer 300 gr. Bergers, as the older lots would not tolerate those velocities. The good news is the newer Berger 300s transition very accurately (as Broz and others can attest)
The 338-408 class weapon systems will have a 135 to 150 gr powder charge so the 103 gr powder charge is a bit off the Cheytac class capacities.
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  #12  
Old 08-08-2013, 01:31 PM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Looks pretty good. I was honestly surprised when those GSC bullets dropped that much below the CEB bullets. They did shoot extremely well however and as you well know, its easy to set up a drop chart to comp for bullet drop as long as the load is accurate and consistant.

Good work. I thought I heard you mention that you were having trouble seeing the bullet impacts from recoil movement on the video. That surprises me as well as my XHS in my 375 AM driving the 350 gr SMK @ 3300 fps are easy to watch bullet impact at ranges over 500 yards.

Perhaps my XHS is a heavier rifle. The large PK muzzle brake may have something to do with that as well.

Anyway, great shooting. Odd to watch a video of shooting in the mountains when the impact dust cloud just hangs there for several seconds. Nice to get a morning like that to shoot in but can be a pain with mirage with very light winds at times.

Good shooting, good video, good report, thanks.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

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Web Page: www.apsrifles.com

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  #13  
Old 08-08-2013, 04:50 PM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Last year at one of the Townsend MT shoots, bigngreen launched several shots to 1K.

His comment was something like "This thing breaks really sweet!"

He was able to see the reflection of the bullet's base all the way to impact.

The big girl, all up, is right at 19.5 pounds. (It's a good thing that I have a 240 pound pack goat trained to carry it and the other LR stuff
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  #14  
Old 08-08-2013, 05:13 PM
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Re: .375 GSC 414 VS CEB 425 at 2050 yards

Ya the PKs do a decent job at recoil reduction and muzzle jump control.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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