I would say that the 40 ammo was hot. But also it was oversize. Dia. That us why it had trouble feeding. When there is no side room off the case to wall it cany exp and release the bullet. Causing a pressure spike. Causing the blow out. I would bet if you took a new round and tried dropping it in the barrel it won't freely drop all the way in.
Lone wolf barrel are tighter also. So it would have amplified the pressures.
Take the barrel out and grab a unfired swampfox load and see if it will fall freely in the chamber.
Last edited by ctious; 02-02-2013 at 12:31..