Been using Hornady PTX's in 9mm, 40, 38/357 & 45acp for 10+ years. They work great & have had no leakage with any powder. I polished the expanding sections as the machining was a little rough. Using these facilitates being able to seat & crimp separately & still having a lockout die. I find using ball powders I get within +/- .1 grains with the Hornady small rotor.