Hello Lippy, lets see if I can answer some questions you have. CCI# 10's, while I have not used them, some of the members here have said they are to small and don't work. I don't remember if they were posting about oem or aftermarket nipples. CCI# 11, again I have not used them but several member's here have posted that they are to big and need to be pinch to fit. I won't do this myself as I believe that could run the risk of a chain fire. I do use CCI# 11 magnum caps on my rifles where they perform well. I tried them on my revolvers, with aftermarket nipples, and very often they required two strikes of the hammer to set the cap off. Remington# 10, this is the one that work's the best for my revolvers but like you said their just about impossible right now to find. RWS# 1075 plus, I just received a shipment of these from midwayusa.com but have not yet tried them. I have read on the various forums that they fit very well on Ampco and Track of the Wolf nipples but are a tight fit with Slix-Shot nipples, with one member who posted, said they won't fit at all. Most folks here have posted that RWS and Uberti nipples were made for each other. Hopefully some other members here will post about their use and the additional information will help you in making a decision.