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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.

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Exploring The Design Space   Ammunition <20mm

Started 25/7/15 by NathanielF; 121873 views.
alexsoddy

From: alexsoddy

2/9/20

For the 6x44 mm, what made you choose the 6mm Unified projectile ?

In what way is it superior to a scaled up 7N6(M) projectile ?

QuintusO

From: QuintusO

3/9/20

It's a bit like a scaled up 7N22 projectile. But I used it simply because I was playing around with it at the time. Far better bullets both I have designed since and have been manufactured commercially.

QuintusO

From: QuintusO

11/9/20

Meet Bearcat:


Here it is compared to its parent design, Archangel:



Bearcat can accommodate rounds about as long as 2.43", and case heads as wide as 0.473" at up to 75,000 PSI operating pressure (~85,000 PSI MAP).

Currently working on the magazine body for the 760 Bearcat, a reference round that performance-matches M80A1 using COTS projectiles:

The 760 Bearcat:



Despite producing 2,800 ft/s with a 130gr bullet from a 13" barrel, the Bearcat weighs just 4.78 lbs unloaded. Fully loaded with the following equipment, it is nearly a pound lighter than the combat weight of a current US Army configuration M4A1 Carbine (image of representative carbine after the specs):

Vortex Razor 1-10x24: 1.34375 lbs

Scalarworks 30mm mount: 0.3425 lbs

NGAL: 0.3 lbs

Brevis II Ultra: 0.46875 lbs

BFG Vickers sling (unpadded): 0.264375 lbs (0.120 kg)

QD mounts (2x): 0.119375 lbs (.0540 kg)

30 round Bearcat Magazine, U/L: 0.3969 lbs

30 rounds 7.62x41mm Bearcat composite case: 1.053108 lbs

  • Edited 11 September 2020 15:03  by  QuintusO
Farmplinker

From: Farmplinker

11/9/20

Will it be cheaper than a Wilson Combat 7.62x40?

QuintusO

From: QuintusO

11/9/20

It's designed to be pretty cheap. You can't know the exact price until you've quoted all your distributors and stuff, but WAG it's not unreasonable to expect a unit cost of $1700 per on the open market. Most parts are made of castings, extrusions, or injection molded polymer. The barrel's the most expensive part, I bet, since it's a composite steel-aluminum dealie.

nincomp

From: nincomp

11/9/20

Gee! That is a big bullet!.  I measured it on my screen and it is about 100mm diameter! :0

Does anyone know a simple way to shrink the pictures down so screen-size?  I damn near get motion sickness from panning around the large image trying to see the whole thing.

Thanks

nincomp

From: nincomp

11/9/20

Thanks! Much better.

tidusyuki

From: tidusyuki

12/9/20

QuintusO said:

Most parts are made of castings, extrusions, or injection molded polymer.

By casting i assume you mean the receivers? why cast instead of hammer forged like a standard AR receiver?

QuintusO

From: QuintusO

12/9/20

No. The upper is made from an extrusion. The lower is injection molded nylon.

Both are cheaper than forging.

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