Well I bought me a 4.2 convertible 45ACP/45Colt and need some sound advice on what to feed it. There is some question as far as sizing goes and I really don't want to start reaming the cylinder on a brand new $800 Ruger. I'm thinking .452 with a crimping groove 225 grain or 250 RNFP. Also would like to push them along a little faster than a SAA on occasion and keep the leading to a minimum. Any and all help is appreciated. Sunfish