Something is not right. '06 should be holding a bullet very well. Of course repeated chambering will set a bullet back. I wonder if this is what happened.
Crimping.....I don't do it for a M-1 Garand. Neck tension should be more than enough to hold the bullet. If the neck won't hold a bullet after F/L sizing, your brass is worn out.
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God Bless our Troops especially our Snipers.
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