Thanks for the great info, very helpful. I'm try to decide if I want to invest in a Clark 460 Rowland kit or play with the Super. I had a Rowland brand 460 kit but wasn't impressed with the barrel and chamber quality. I've got a throat reamer to touch up the barrels on my 45's so they'll all feed the same length ammo so knowing a OAL that works in advance is helpful. I've already got brass for the 460 so I may just go that way. The Kimber shot pretty nice with the comp and I'm going to put a flat firing pin stop in, which should help with slide velocity either way. I've got a six banger mold for the Lee 252-255 RF to start with on the heavies.