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Military Guns and Ammunition

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This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons, particularly in larger calibres (12.7+mm).

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New rifle cartridges accepted by SAAMI   Ammunition <20mm

Started 19-Nov by autogun; 355 views.
autogun

From: autogun

19-Nov

As reported by TFB:

Developed by SIG SAUER, the 277 SIG FURY was introduced with a maximum average pressure of 80,000 psi, with a 135-grain bullet traveling at a velocity of 3,000 fps.

Developed by Weatherby, the 6.5 Weatherby Rebated Precision Magnum was introduced with a maximum average pressure of 65,000 psi, with a 140-grain bullet traveling at a velocity of 3,075 fps.

Developed by Olin Winchester, the 6.8 Western was introduced with a maximum average pressure of 65,000 psi, with a 175-grain bullet traveling at a velocity of 2,840 fps.

EmericD

From: EmericD

19-Nov

There is a small error in the second page of the .277 Fury, a twist of 7" is not equal to 254 mm.

But the selection of a 1-in-7" for a .277" bore is interesting, it's even shorter than a 1-in-8" in .308".

EDIT : and the 175 gr listed for the 6.8 mm Western is strange (170 gr is already pretty heavy for .277").

  • Edited 19 November 2020 6:05  by  EmericD
Farmplinker

From: Farmplinker

19-Nov

Ultra long range cartridge I'm guessing; so you're going to want a long streamlined bullet to make it easier to hit.

Red7272

From: Red7272

19-Nov

Farmplinker said:

Ultra long range cartridge I'm guessing; so you're going to want a long streamlined bullet to make it easier to hit.

Seems improbably heavy. Same SD as the 250 grain .338 if it does actually exist. 

EmericD

From: EmericD

20-Nov

Yes, there is a significant length available outside the case, but the heaviest .277" bullet I know of is the Berger 170 gr EOL with a C7 of 0.339, already better than the 250 gr class of .338" bullets.

Hence my comment, maybe someone knows about this 175 gr / .277"?

EDIT : another offspring of the .404 Jeffery case, and a "long range" version of the .270 WSM?

  • Edited 20 November 2020 3:34  by  EmericD
Farmplinker

From: Farmplinker

20-Nov

I'm sure The Firearm Blog, or at least the websites of some of the gun magazines will give us the information as soon as they can. 

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