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Old March 2, 2013, 08:00 AM   #4
Senior Member
Join Date: May 25, 1999
Location: Too close to Houston
Posts: 4,196
I imagine the powder is all burnt before the bullet is a foot down the bore. The supersonic cloud of expanding gas at the muzzle makes the bang.

I use H335 powder and my AR is a 16" barrel.
The 16" barrel has more to do with it than the powder, IMHO.
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