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Posted: 9/22/2008 9:30:43 AM EDT
I have shot this load a thousand times with no problem but all of the sudden the firring pin is penetrating the primer (400 CCI) It shoots other factory loads just fine, I replaced the firring pin and it did the same thing, weird thing is that it will fire 20 some rounds and not do it, has anyone had this problem? What primers should I get to not have to worry about that? mil spec?
Link Posted: 9/22/2008 2:58:54 PM EDT
Well you could try the CCI 41s, which are CCI magnum primers with slightly thicker cup, and the anvil is further from the primer. Note, they are magnum primers, adjust accordingly!!! But, before you do that, find an AR-15/M16 firing pin protrusion gauge. That'll tell you if your firing pin is coming out too far. If it is, you might be in for a whole new BCG.
Link Posted: 9/22/2008 9:10:59 PM EDT
where do you get that tool?
Link Posted: 9/22/2008 10:14:01 PM EDT
Link Posted: 10/9/2008 11:19:01 AM EDT
had my gun smith check the and it was .032
Link Posted: 10/9/2008 1:55:11 PM EDT
Is the hammer spring stock?  Weak springs and light hammers can cause this as the residual force helps hold the firing pin against the primer, reinforcing the primer.

Also, check the bore,especially the throat.  Worn or excessively dirty throats can raise pressure.  Run a new bore brush through the bore from the chamber, if it gets easier as you get down the bore, you need to clean the throat.
Link Posted: 10/17/2008 8:55:35 PM EDT
I ll try it but I have a feeling it was the primers, I fired M855 and did not have any problems,
I am making another load using Military primers and another bolt.
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