corrosive ammo questions???

[AGE]

Guys,

I did think (finally) to look at the primer in the offending Silver Bear case. It is badly bulged and puckered up around the primer dent which is much deeper than normal. I didn't remember that the round was noisier or recoiled more than usual, but the primer looks like an overpressure round to me (although I normally don't shoot hot ammo).