Some folks have got many dozens of reloads per .308 Win. case. They use full length sizing dies without expander balls, don't set the fired case shoulder back nor size body diameters down more than 2 thousanths. And with max loads, no annealing and no primer pockets failing to hold primers.
If your cases' primer pockets open up too much to hold primers before 20 to 30 reloads, you're probably putting too much powder in them. And the peak pressure's probably over SAAMI specs. Most cartridge brass starts extruding/expanding at about 65K to 70K cup. That's why SAAMI max average pressure specs are in the 50K to 58K cup range.
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Last edited by Bart B.; January 16, 2013 at 07:32 AM.