I can make use of the CCI percussion caps on all my black powder pistols and rifles. The in shape is excellent and do not slide off. I've had some non ignition problems but In general I’m pleased with them. Haven’t gotten a reply from enterprise but will #10s match https://cimarronwyattearpbuntline29629.daneblogger.com/15784580/an-unbiased-view-of-cci-34-7-62mm-military-primers