The inconsistent ammo is obviously the issue as evidenced by all the other rounds functioning just fine and not getting stuck in the chamber and having their rims ripped off.
Post a picture showing 10-15 spent cases from the properly functioning rounds so we can see what the case heads and primers all look like.
If there is a PATTERN of high pressure with pull marks on rims, we can surmise that you had a whole bunch of high pressure cartridges, but your gun was just able to deal with them.
If the rest of them have proper-pressure-looking-primers, then that shows us the inconsistency of the ammo.
Post a picture showing 10-15 spent cases from the properly functioning rounds so we can see what the case heads and primers all look like.
If there is a PATTERN of high pressure with pull marks on rims, we can surmise that you had a whole bunch of high pressure cartridges, but your gun was just able to deal with them.
If the rest of them have proper-pressure-looking-primers, then that shows us the inconsistency of the ammo.
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