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What powder/bullet loads are you running?
(Minimum loads per the manuals usually mean anywhere from low 30's to mid 40s Kpsi -- low/moderate pressures)
Combine that w/ a case that's sized too short and you have protruding primers when they don't stretch (as w/ sizing lube left on case), and flattened primers when they do (dry case locks into chamber walls up front and the rear then stretches to meet the bolt).
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