Blown primers...overpressure
#32

A too-light charge of slow-burning powder can cause the symptoms you report as well as too much powder. It takes over 65,000 PSI to blow primers. I can't recommend shooting any more of the loads that gave you this result! Best to start over!
#33

Well my Dad shot some .270 WSM today (2.5gr below max load, new brass) and he also blew half a dozen or so primers...I'm kinda thinking we got a bad lot of primers...??
Last edited by jeepkid; 08-29-2009 at 07:47 PM.