i'm relatively unexperienced so please correct me if i'm wrong.
i've heard that 2011 is pretty much impossible to fire out of battery.
i've tried it with my gun, i can pull the slide back about 3mm and still launch a pencil across the room, but at that point, the barrel still appears to be locked up to the slide.
if i pull the slide back any further, i can no longer pull the trigger due to disconnect.
and also the barrel starts to cam down, so the firing pin don't line up to the primer anymore.
also, i fired about 300 rds that night, most of the extra bulgy cases were pmc, with a couple of oddball cases.
it makes me think the cracks are developing inside the cases from be fired and reloaded, which eventually weakens the case wall at that area and causes the bulge to get worse.
pmc on the right, win case on the left for comparison
the bulge on the pmc appears to be the same height as any of my other brass that i've shot that day.
only pmc cases are getting the occasional extra bulginess.
and extra bulgy always correspond to the crack inside.
when i do the plunk test, the area exposed at the feed ramp is only about half the width of the bulges.
could it be a gun problem, like it is unlocking too soon or something?
gun seems to be running fine otherwise