Here is a theory, tight chambers plus dirty chambers and out of spec ammo are the root causes. My guess is that folks are running these guns hard during a range day with known dirty ammo WInchester, Remington, federal bulk thus fouling the chamber causing a round to stick and fire OOB. Might be interesting to understand round count on the day of the failure to determine if dirty chambers are a culprit.

Out of spec ammo, especially with the shortage ammo mfgs are pumping out millions is 22lr per day, I guarantee you that quality control is not as good. I've read on another forum that Remington bulk that caused a OOB on a 10-22 was noticeably deformed from the factory.

The OOB failure are not limited to 15-22 other shooters are experiencing this issue. Just do a search.

Might be good to run a patch or bore snake every 100-200 rounds and use non-bulk ammo.