Thread: S&W AR MP15
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Old March 5, 2013, 10:55 AM   #2
allaroundhunter
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Join Date: May 6, 2012
Location: Southeast Texas
Posts: 1,670
Stainless actually has a shorter barrel life than most other barrels. The 1:9" barrel twist is typically good up to about 62 gr, but 69 gr projectiles can be hit and miss depending on the gun. Most of the time anything above 69 gr won't stabilize in any 1:9" twist.
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