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.375 Cheytac or .375 Snipetac

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Unread 12-02-2010, 05:02 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
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Re: .375 Cheytac or .375 Snipetac

I have never had any hangfire issues with my 375 Allen Magnum which is just a lightly more extreme version of the Snipertac. In reality, performance wise, very similiar, just a bit different case design.

I have used up to 146.0 gr Retumbo and as low as 135.0 gr retumbo under the 350 gr SMK and never had any hangfiring. From velocities from 3100 up to +3300 fps.

Perhaps your hangfires are more from the increased body taper and shallower shoulder angle and maybe a bit to much bump on the shoulder of the case?

It has never been a problem to get low teens for extreme spreads with any of my 375 AMs but as Joel mentioned, they are very consistant.

I considered the fireforming issue when I released my 375 AM as well as my 338 AM and that is why I had Jamison make me my own headstamped brass and I offer fully formed cases for customers to eliminate that concern and barrel wear.

If you look at the factory load specs for the 375 Chey Tac, there is much more to be had with the Improved versions but that is mainly because Chey tac loads their ammo rather mildly by most standards and the ST and my AM are loaded to top working loads.

With my accuracy load, 144.0 gr Retumbo under the 350 gr SMK, I am running around a 95% load density. Still air in the case but plenty full and no chance of powder fracturing.

I am surpised you had hangfire issues with H-50BMG but not with US869 or AA8700 which are much more difficult to ignite then 50 BMG.
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

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Unread 12-02-2010, 09:51 PM
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Join Date: Sep 2008
Posts: 327
Re: .375 Cheytac or .375 Snipetac

Yep no problems here with my 375CT either.... maybe you got a bad batch of primers or a bit of moisture from somewhere or something???

And for the OP, the 375CT already pushes 350gr @ 3200fps from a 34"bbl... i dont really see the need for anymore ballistic performance than this!

All comes down to the fire forming brass issue and could you be bothered or not...
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Unread 12-03-2010, 08:20 PM
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Join Date: Jan 2007
Posts: 87
Re: .375 Cheytac or .375 Snipetac

Fiftydriver and groper,

Thanks for the info.I haven't tried H50BMG yet.The powders I used were IIRC 5010 and one of the Vit 50 cal powders.This was three years ago when I tried them and it was a short lived experiment.

I had minimum shoulder bump on the cases,.0015. Retumbo has worked fine with no hangfires.R-25 had been the main culprit with the hangfires.It was quite a process finding the right powder and projectiles back then.I got the gun right when Lost river went out of business,arrrg.For some reason I tried Retumbo last???

Fifty,That's great you have your own improved 375AM and 338AM brass already formed if wanted.Great idea!

If your getting low ES/SD and good accuracy then enough said.Can't argue with success!

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Unread 11-24-2012, 10:51 PM
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Join Date: Nov 2012
Posts: 65
Re: .375 Cheytac or .375 Snipetac

Gentlemen, in this discussion you mention fire forming brass. If you don't mind educating me, which of these two rounds requires being fire-formed and which does not? I am looking to build my "dream rifle" and I am debating between several calibers including the different .338's, .378's, and the .408. I am also concerned with the lack of commercially available ammo with the Snipetac.
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