starting with cleaned chambers and loading the K-22 & M-63 after firing the empty cases have to be knocked out. using the ejector won't budge them. out of similar guns the automatch ammo doesn't chronograph any difference in velocity compared to other 22 ammo such as Winchester powerpoints and the Federal Champion bulk packs and no ejection problems either. there aren't any warnings about what guns they should be fired in. I know S & W 22 revolvers can be a little finicky but I think this goes beyond that point I think. anybody else tried them in a K-22 or M-63 and have any problems.