Was checking sight=in in preps for saturday and had a blown primer on the wife's 7mm mauser in Ruger 77.
Old remington ammo circa 1992 according to Remington rep I talked with.
Noticed it immediately as smoke came wifting out around the bolt after the shot. Thank god for modern bolt actions that vent escaped gases away from the face, otherwise I might be blinded in right eye like Paul Mauser.
I'd wiped the bore and chamber, first prior to sight in, and it was on second shot that it blew. I've never had a blown primer that bad before. The face of the bolt is now etched around the primer edge and it also cut some streaks heading towards outside face of bolt. It had to be hot. The brass was not corroded in any way from outside. The bolt came up with normal resistance and I swabbed the bore and gave a visual inspection. At this point I looked at the first brass shot and it had a classic flatten primer showing excess pressure with flow around the primer. Two hot shots and that point I called Remington to see if I had missed a recall? No
They are sending me a envelope to send them back what remains in box only three left and of course the brass that I'd kept prior for many years.
After putting on some shooting glasses, duh, I fired a round from another Remington lot and it appeared as normal pressure.
Decay of powder? It's most likely that this ammo may have seen a season or two in the field, but doubtful that it rode around in the truck for seasons on end because this is the wife's ammo and she mostly just hunts out back. 19 years, hard to know exactly how it was stored.