[white trash redneck]

Folks also sometimes forget the effect of ambient temperature on pressure. A max load with safe pressure when it's in the 50's can be too hot when the temp is in the 90's.

[EBUCK]

You are right. Also the loads could have been old and the cases swollen or fractured from over use. Always use new or once fired brass is a good rule.

EBUCK

[6ppc]

Folks also sometimes forget the effect of ambient temperature on pressure. A max load with safe pressure when it's in the 50's can be too hot when the temp is in the 90's.

Yeah, but not enough to blow up the chamber on a modern rifle. My guess is he forgot to put powder in a round and the primer had enough pressure to push the bullet into the barrel (it's happened to me). When he pulled the empty case from the chamber he probably looked at it a little funny then decided he had a brain fart and forgot to pull the last fired case from the chamber, loaded another and pulled the trigger.