Speer Shot Capsules
I used the gascheck, shot, inverted gascheck, method for my 45 Colt back in the day. Seemed to work fine, but I never had to shoot a snake with it. Sold the 45.
Fast forward 20 years, and I've now lived in rattlesnake hell for around six years. Average around 7-8 killed per year. I bought a little 3" Rossi 68 and I load the Speer capsules & #9's. I don't remember exactly how many I've killed with that pistol and load, but it absolutely SHREDS snakes. I think I'm loading 2.5 grs. of Bullseye.
I can't imagine why a person would have these "walk out" and bind the cylinder. I put a fairly heavy, visible crimp on mine and have never had them creep out of the case.
Regarding powder charge, Speer recommends less, not more stating that higher powder charges can ruin the pattern.
35W