I have been experimenting with handgun bullets using cartridge cases. I find that there is so much weight variation in (even) same brand cases that I can't believe any accuracy potential is there. Have mostly been experimenting with 9mm cases swaged up to 10mm and .40S&W drawn down to 10mm. I've trimmed cases to +- .001 by both trimming the mouth or the rim or both to arrive at a length suitable for 165 grn bullets. Out of a batch of 50 (or so) cases I am getting a weight variation of over 6 grns. Haven't loaded or shot any as yet and am somewhat hesitant to waste time swaging bullets with so much variation. My interests lie in punching holes in paper - not in plinking cans or dirt clods. Anyone out there done any serious experimentation with cartridge brass jackets; if so what were the results? I'm using a PCC in 10 mm which is capable of 30 yard groups not much over an inch with gilding jackets of which I still have a modest supply.