I too have had 22 tumbling issues recently, in my case from an older 4" Dan Wesson Model 22. It seems like some 22s have shallower rifling than others, so as in my case, fouling builds up quick and fills the grooves. I made the choice to trade the DW for a 17-9 in the end, though I could manage the bullet tumble issues by keeping the bore thoroughly clean and de-leaded, and by using jacketed HV ammo instead of SV lead round-nose.

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