gatnerd

Military Guns and Ammunition

Hosted by gatnerd

This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.

  • 3361
    MEMBERS
  • 191225
    MESSAGES
  • 3
    POSTS TODAY

Discussions

NGSW Phase 2 Consolidation and info   Small Arms <20mm

Started 30/8/19 by gatnerd; 553871 views.
EmericD

From: EmericD

4/6/22

BruhMomento said:

alr boys jesus dropped the vid on the xm5

So, the "practice round" is a 135 gr / 0.475 G1 at 2650 fps (my own guess) from the XM5.

8.75 g at 808 m/s equals to ~2850 J and ~7.1 N.s of impulse with a suppressor, that's:

  • 40% less impulse than the 7.62x51 mm without a suppressor,
  • 20% more impulse than the 5.56x45 mm without a suppressor.

The 0.475 G1 is not very high, but that's around 0.242 G7, so in the same league as the .308" / 175 gr SMK used in the M118LR, which is advertised as 792 m/s from a 24" barrel.

This "low recoil & practice" 6.8x51 mm fired from the M5 is delivering as much impact energy above 500 m as the 7.62 mm M80 fired from a M14, with 40% less impulse.

So, that could explain why people shooting the gun are impressed by it, but could also explain why SOCOM resumed it's 6.5 mm CM program.

poliorcetes

From: poliorcetes

4/6/22

I wonder if part of the hardware responsible for the funcionalities of a smart sight could be migrated outside of the rifle (mainly on the body or helmet of the user)

poliorcetes

From: poliorcetes

4/6/22

it also would be related with sights evolution. During world war II or Korea, optics were either febble or crude, and were reserved mostly for sharpshooters and snipers.

Now we have NGSW-FCS and what is going to follow it. 

Now the probability of hitting a moving target at 600m is not abysmal anymore, and supression derived for very close fails is going to be a thing

RovingPedant

From: RovingPedant

4/6/22

poliorcetes said...

I wonder if part of the hardware responsible for the funcionalities of a smart sight could be migrated outside of the rifle (mainly on the body or helmet of the user)

With the intention of making it lighter? I think most of the heavy bits need to be boresighted to the rifle to be effective, with only the computer and the environmental sensors that could be mounted somewhere else.

Then splitting it up means that you have to tie the two parts back together either physically (tying you to your rifle) or wirelessly (meaning that you are now constantly emitting). which seems less desirable than making your rifle slightly heavier.

EmericD

From: EmericD

4/6/22

poliorcetes said:

Now the probability of hitting a moving target at 600m is not abysmal anymore, and supression derived for very close fails is going to be a thing

I'm not really convinced that the FCS will really help to hit a moving target at 600 m.

First, because the "acquisition sequence" (detection / ranging / aiming / firing) will take several seconds, second, because the round will still need ~1 second of flight to reach the target.

But against a visible, static target (something very rare on the battlefield), the FCS will be a huge game-changer.

Anyway, congratulations to the US Amy for selecting the .276 Pedersen as its new service cartridge, 90 years after its first rejection!

Apsyda

From: Apsyda

4/6/22

Is she firing the steel baseplate ammo or the brass cased ammo?

I've seen a lot of videos on line where the shooter is talking up the soft recoil of the XM5, but is only shooting the softer brass cased ammo.

stancrist

From: stancrist

4/6/22

Apsyda said:

Is she firing the steel baseplate ammo or the brass cased ammo?

Brass cases.

stancrist

From: stancrist

4/6/22

EmericD said:

Anyway, congratulations to the US Amy for selecting the .276 Pedersen as its new service cartridge, 90 years after its first rejection!

Actually, the .276 Pedersen was a 7mm cartridge, not 6.8mm.

However, the Chinese were 115 years ahead of the US Army.

6.8x57 Chinese Mauser

stancrist

From: stancrist

4/6/22

EmericD said:

This "low recoil & practice" 6.8x51 mm fired from the M5 is delivering as much impact energy above 500 m as the 7.62 mm M80 fired from a M14, with 40% less impulse.

So, that could explain...why SOCOM resumed it's 6.5 mm CM program.

I don't follow.  How does it explain why SOCOM resumed work on the 6.5 CM program?

Farmplinker

From: Farmplinker

4/6/22

The 6mm Lee cartridge will rise again!

TOP