gatnerd

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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NGSW Phase 2 Consolidation and info   Small Arms <20mm

Started 30/8/19 by gatnerd; 707504 views.
Farmplinker

From: Farmplinker

3/3/23

"Stoner-inspired" is what we'll call it.....

Kind of like the DI "Kalashnikov".

roguetechie

From: roguetechie

3/3/23

I take solace in knowing somewhere in hell Melvin Johnson is pissed off every time someone says this lol.

Melvin Johnson: Am I a joke to you people?

Yeah Melvin kinda hah.

Oh well at least Melvin can be consoled slightly by seeing good old jean bristle at mostly being "known for" a design he spent the rest of his career trying to knock off it's pillar...

There's a lesson in this somewhere I'm sure but I'll be damned if I can come up with what it is. For anyone who thinks gene didn't at least somewhat hate what the AR became take a look at the FARC, it's about as far from what we think of as the AR as you can get while still being a gun 

manimal87

From: manimal87

13/3/23

https://youtu.be/XPOoncsRICA

Any news on that? I mean is just the rifle program canceled or the LMG (XM250) too? 

stancrist

From: stancrist

13/3/23

AFAIK, the XM7 has not been canceled.  That video is based on an Army Times opinion piece (The not-really Next Generation Weapons Program) in which the author thinks that the NGSW program should be canceled.  This bozo took the author's opinion as fact.

taschoene

From: taschoene

13/3/23

And that author seems to have no experience with infantry small arms beyond watching a bunch of YouTube videos.  I mean, I enjoy InRange TV most of the time, but their "mud test" is not a serious controlled trial under realistic conditions.  And I don't think anyone has been doing YouTube tests with representative AP ammo at actual XM7 pressures.  Which isn't to say that the XM7 can actually deliver -- I have no idea.  But civilian YouTube videos are not a credible test of that.

I still have 2 of my own 6mm cake(TAC6) rifles based on a 6.8 case and built on the LWRC SIX8 platform.  18" barrels, 90 ScenarL-95SMK bullets at 2800fps. For all practical purposes it is a 30 Herrett necked down to 6mm using 6.8 cases trimmed back to 1.59" but loaded to 2.3". Mag cap is 30 rnds.

At 100yds  energy is 50% more than SS109 and at 200-300YDs the energy is double, the 308 shooting 155gr Lapuas would only have 50% more energy than the TAC6.

Recoil doesn't seem to be much more than a 5.56, less than a 6.8 and much less than a 308. Timed through the shooting house I am much faster than any 308 I have tried, HKG3, M1A, AR10 and the lightweight DPMS G2 with a mid gas 16" barrel on it.

I know for myself the weight of the rifle and ammo combined along with heavier recoil slows me down...a lot, I would rather carry one of the 6mms than the 308s.

EmericD

From: EmericD

26/3/23

Harrison Beene (harrisonbeen) said:

I still have 2 of my own 6mm cake(TAC6) rifles based on a 6.8 case and built on the LWRC SIX8 platform.  18" barrels, 90 ScenarL-95SMK bullets at 2800fps.

We recently tried a LMT rifle chambered for the 6 mm ARC, and measured only ~780 m/s (2560 fps) with the 105 gr BTHP from a 18" barrel (2070 J at the muzzle vs. 2120 for your 6 mm SPC).

It seems that the AR-15 bolt diameter is a real limiting factor, and increasing the case diameter should be followed by reducing the cartridge MAP, so no real benefits at the end of the day.

Here, we are still testing the technical "bricks" to make a neckless 5.56 mm NATO.

We tested a 64 gr solid bullet with a C7 BC of 0.208, but the accuracy wasn't really good due to the large initial yaw of the design. We changed the boat-tail shape, the C7 BC dropped to 0.201 but the accuracy issues were solved. We were able to launch this bullet at 945 m/s from a 18" Mk12 rifle. The case was a regular 5.56x45 mm, but trimmed to 40.5 - 40.7 mm.

This bullet was lathe-turned but we started to study cold-forming, when the need for "increased penetration against ceramic armor" emerged, and derailed this effort.

So, now we are going to scale-up this bullet to .264", with a long steel core, and load this bullet in a high capacity .260 Remington steel case. The case capacity is ~20% higher than brass case (3.6 cm^3 excluding the neck and half the shoulder), weight is only 7.1 g, and we should be able to reach >970 m/s from a 18" barrel and with a bullet in the 95 - 100 gr class (for a cartridge mass around 17.0 - 17.4 g).

gatnerd

From: gatnerd

26/3/23

Seems Australia is developing its own 6.8x51 that does not use a 2 part case like SIG:

https://www.instagram.com/p/Cn26BxHvYDH/?igshid=YmMyMTA2M2Y%3D

gatnerd

From: gatnerd

26/3/23

Harrison Beene (harrisonbeen) said:

I still have 2 of my own 6mm cake(TAC6) rifles based on a 6.8 case and built on the LWRC SIX8 platform.  18" barrels, 90 ScenarL-95SMK bullets at 2800fps. For all practical purposes it is a 30 Herrett necked down to 6mm using 6.8 cases trimmed back to 1.59" but loaded to 2.3". Mag cap is 30 rnds

Super cool. Thats very close to the dream 6mm CAKE AR12 right there.

Does the round have enough space to fire the 88gr Cutting Edge? 

https://cuttingedgebullets.com/243-6mm-88gr-mth-match-tactical-hunting

Thats the projectile I've been thinking would be a good off the shelf surrogate for a future EPR style lead free VLD.

EmericD

From: EmericD

26/3/23

Is it a crack running around the "6.8x51" mark, and an ejector mark between the "BB" and the kangaroo?

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