I know that I am reviving an old thread but I didn't read where you ever found the solution. If you are using Rem 6 1/2 primers in a .223 you are using a primer that Remington says not to use, it is too soft for the floating firing pin. They say to use the 7 1/2 primers. CCI #41 primers are specifically designed for the AR with a thicker primer cup. Here is a good article on primers.
http://ingunowners.com/forums/ammuni...ht-primer.html



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