A few years back, I obtained a '58 Remington clone (I believe an ASM) that came to me missing the cylinder. I finally got around to fitting a replacement and had my first range day today. My selection of caps included a CCI #10 and 11, Remington #10, and RWS (I believe) 1057's.
I had several failures to detonate on several of the caps, but the biggest problems were caps falling off the nipples under recoil and fragments of ruptured caps hanging up cylinder rotation.
I understand there are several ways to address this - what's working for you?