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I've been reading about Special Forces' new idea for a rifle.
HICAR.
The super special ammo is 5.56x45mm in all but one respect: 82kpsi chamber pressure.
Normal 5.56 is around 55kpsi and M855A1 runs about 62kpsi.
So, about a third higher than the current round that's causing issues with bore erosion.
Why do they need this higher chamber pressure?
To get the exact same velocity as a 20" barrel gets while using an 11 to 12 inch barrel.
And a suppressor...
Always lose the handling gains from the short barrel by bringing it right back to the previous length with a suppressor.
But there's good reasons to want one, and they have them.
But I am waiting for the day that some normal soldier loads a spiffy M855A1+ round into their M4 and... Well, the proof round is about 77.9kpsi.
Ever wonder why .357 Magnum is 0.1" longer than .38 Special which is 0.12" longer than .38 Long Colt?
It's to keep this exact pressure mismatch from happening.
I can't help but think that an M16A4 is a lot handier, even with a suppressor, than a Garand, and an excellent training exercise would be to show them exactly HOW handy a 20" M16 can be. That way they don't introduce a dangerously high pressure round into the supply system just to recreate the velocity that standard pressures make with a longer barrel.
While we're at it... Make a flat-top pencil-barrel M16 available to them to remind everyone that the A2 and A4 are unnecessarily heavy.
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