When I first started loading pistol ammo, I only had pistols that had generous chambers like a Beretta 92FS or Sig 226. When I started shooting pistols with a tighter chamber ie CZ Shadow, Springfield RO and LoneWolf 40-9 barrel, I would get about 1-2 out 50 that wouldn't chamber properly. After doing some research, a lot of folks on various forums were recommending the Lee carbide FC die as the last stage. After picking one up, I've yet to have a round that wouldn't chamber.