with 22s, you HAVE to find a brand that your pistol/rifle LIKES , and stick with that- be it dynapoints. federal bulk, wildcats , whatever- PRICE IS NO INDICATOR OF QUALITY-case in point i have a '51 beretta 948, and it's VERY fussy as to what ammo you feed it- i also have a beretta neos, which just plain doesn't care -and you're going to get the odd ftf, and "other things" like won't chamber( although that's a new one to me- must be an oversized case or something) -although i have had the very ODD one that you have to push on the charging handle to close it- what i do is do my first magazines, and put the duds to one side- 10, 25, whatever number of rounds- then reload the duds into the mag, and put them in such a way so that the firing pin strikes a DIFFERENT part of the rim- and most times it WILL fire- if it is still a dud, then into the dud bin it goes if i don't have another gun to try it in- every gun has a different set of strengths, and a stronger spring might get the job done- and i beleive that the priming mixture sometimes acquires a "dead spot" and won't fire if you just happen to hit that