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Old February 19, 2013, 12:23 AM   #3
Marco Califo
Senior Member
 
Join Date: April 4, 2011
Location: LA
Posts: 807
Floating firing pin can cause slamfires

For this reason many use primers with a harder cup. I use CCI #41 which are what are used for all US military 5.56. I don't know about Win SRP, but when I was using CCI SR (maybe 400 or 450), I blew holes in the primers with some "warmer" loads.
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