I'd check the ammo in a gun nknown to function well. With the demand of .22 ammo today, quality is bound to have dropped. Polish the chamber well. are these hollowpoints? any sign of dragging on the ejected live rds? if so, gotta polish off whatever's grabbing the bullet. might be getting debris in the action from that deal.
yes, check extractor and ejector and breechface dimentions, polish, spring tension. my bet is on a rough chamber, [beeep]