Thread: gun noise ?
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Old December 10, 2012, 11:23 PM   #11
Brian Pfleuger
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Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,520
Ah.

The 223 runs lower muzzle pressures than I'm used to seeing, due to having a smaller case capacity than anything I use. Even my .204 Ruger had about 30% more capacity.

Anyhow, a 16" barrel with 25.0gr H335 under 55gr bullets is going to run just shy of 11,000psi, while a 20" barrel would run 8,500psi.

8,500 is close to what a "normal" rifle would run, like a .308 or .243 with a 24" barrel.

11,000 is going to be loud. My 15" barrel Encore chambered in 7mm-08 runs about 14,000 and it's much, muUCH louder than a typical rifle.
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