IMHO primer seating depth is more critical than primer selection to a degree as if you have high primers any can slamfire. I'm not saying don't use mil-spec primers but if they are seated high it doesn't utilize the extra protection they offer. They should at least be seated flush but preferrably below flush to .008 max. This gives some built in firing pin/primer clearance at lockup. I uniform all primer pockets for gas guns, period and I've used Winchester, Remington and CCI; no slamfires to date(knocking on wood). Uniforming replaces pocket cleaning in my prep process and I've yet to wear out a carbide cutter.
Brian
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