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Old March 11, 2012, 10:27 AM   #3
m&p45acp10+1
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Join Date: May 3, 2009
Location: Central Texas
Posts: 3,307
The bullets are lead free. Though they weigh 50 grains they are closer in bearing surface to a 60+ grain bullet. Hence the need for faster rifling. It probably says 1in10 or faster rifling on the box. The boxes I have seen all say that right under the bar code.
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