Originally Posted by joedjr
I reloaded some 40 S & W.. I am almost certain I didn't double charge the casing due to the casing being 2/3 full with a normal charge. Also I did not seat the bullet deeper than instructed. Can anyone give a good reason why the rim blew off this casing. I was shooting a Beretta 96FS which will need to go back to beretta because of the damage to the gun.
Powder is Unique 6.5grs, bullet is uni-cor 180 gr TMJ seated 1.124 with federal small pistol primer
I am using a single stage RCBS Rock Chuckar and RCBS Uniflow Powder Measure
I would have guessed this was the ubiquitous glock G22 kaboom!
It has the same failure mode displayed with the combination of weaken brass and a partial supported chamber.
I'm not familiar with the beretta 96FS chamber design but the forensic evidence is pointing that way.