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Old December 3, 2012, 07:03 PM   #6
hounddawg
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Join Date: March 1, 2009
Posts: 760
Quote:
Case separation from pushing the shoulder back to far on FL sizing is the cause.
that's it but in my gun it is because I have the head space a bit too tight so same thing

Quote:
By any chance were these less-than-full-up loads?
39 gr Sierra on 24.5 grains of RL10 3700 FPS factory OAL. Not a full case but within a half inch

went back through a tin of my fired cases and culled about 10 more. Pulling the barrel and resetting it tomorrow
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