File under "obvious when you think about it".
The suppressor on the M7 and XM8 is necessary because the insane chamber pressures and short barrels mean the muzzle blast is otherwise a health hazard.
Even with hearing protection, I am told.
That's got me wondering just how high the pressure IS at a bare muzzle.
It also has me wondering just how quiet the weapon is, because the M7/XM8 advocates are quick to point out that an M4 is longer and heavier with a suppressor too.
But I know how much quieter an M4 is with the issue suppressor, it's nearly naked ear safe. That's worth the extra length and mass.
If a suppressor is needed to bring it back to M16 bare muzzle sound pressures... Couldn't we get the same thing from 5" more barrel and lower chamber pressures?
I ask because 6.8x51mm is emulating .270 Winchester in bullet weight and velocity; the big difference is pressure and barrel length.
.270 is using 24" of barrel, but far lower pressures.
It makes me wonder if my Savage is quieter than an XM8.
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