chicharrones
needs more ammo
if cleaned from the start, why would it take less rounds before extraction problems begin? the chamber should be "broken in". I think the difference in half the ammo shot before extraction problems start could be ammo specific.
Those counts are clean from the start. Most reliable ammo I used in that particular gun was solid round nose CCI Mini Mags. My Bobcat didn't run well with hollow points or prominent shoulder profile bullets in .22 LR.
The gun is clapped out now and is pretty much a single shot.
I replaced the usual suspect parts many years ago, but the chamber is pretty much no good anymore from all the times I've had to smooth out dings from ammo misfeeds. Most hollow point ammo would stovepipe right out of the magazine and the rim of the cartridge would get slammed sideways into the chamber opening by the slide. The fact that cartridge brass would be stiff enough to ding a steel chamber mouth in my Bobcat was extremely frustrating.