I use CCI #11's and RWS 1075's. ONLY because I get them locally. With my Pietta NMA Sheriff (<the range hound) I have to put the Ted Williams capper down and put the nipples on by hand with a pinch to get them to fit tight. No cap jams etc. But it sure would be nice to use a capper. I still have yet to buy new nipples. I'm too caught up in buying guns