I shoot that same bullet - cast of straight wheel weights and PC'd - as cast (unsized) through a CZ-75, a Stoeger m8000 Cougar, an S&W 915, and even an HK P7 with nary a problem. My son's CZ P-01 won't chamber them, though. I suspect the chamber reamer used on his CZ was about worn down to minimum spec. We have a pair of S&W Equalizers, an S&W EZ, and a Springfield something-or-other (tiny little feral monster made on the XD-ish pattern - horrid little beast) that we need to try them out in soon as well.