Pressure spike

bmart2622

WKR
Joined
Jun 16, 2013
Messages
2,177
Location
Montana
I was shooting my 300 ultra mag the other day using the same loads, brass, primer, and bullets I have for several years. I got extremely hard bolt lift out of nowhere, stopped shooting and went home and loaded some lighter loads, went back to the range and fired a cold bore shot of factory Hornady ammo and blew the primer out of the back of the case. Any ideas what is going on?
 
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