Maybe just me, but I get a big percentage of Remington bulk box .22s that don't go bang. But I like the brass because it seems to be cleaner inside than most others after firing. Anyway, I usually pull the lead from duds, fertilize the lawn with the powder, and clean 'em up like all the others for derimming(boiling water/Dawn for me). Reading one of the other threads where discussion came up on size of derimming punch made me curious enough to go to my man-cave and mike my punch(0.200" BTW), then hey, I'm there , oughta do something , so grabbed my pile of cleaned and dried .22 LR Remington brass and started derimming - the third one went "CRACK", I'm "What the H... ?", smelled like a cap gun went off. Thought maybe I had pulled a bullet from an unfired .22 LR by mistake, so after cleaning punch, went back to derimming, visually inspecting for firing pin mark on each first - had 2 more "CRACKs" before finishing. Weird, huh ?
So I know that Dawn and boiling water will not remove unfired priming compound from Remington brass and that it may still be potent after drying. While no damage appears to have been done the debris from the compounds can't be doing my punch (or nerves)any good so in the future, I won't be as frugal, I will toss the dud brass !