Hey-I'm in the middle of having a 25-5 8 3/8 worked on by pinnacle high performance, who was recomended by a couple of folks on this forum. Mark-the sole owner and opperater at Pinnacle does a lot of this kind of work, and maintains that both of these rounds function well after his work. I am primarily interested in shooting ACP's out of a long barrel. I have used 255 gr lead SWC's in my 625-8 and my 25-2 with very favorable results. They are, after all, the same diameter-.452, and they seem to handle a fairly heavy charge very well. The gun is at Pinnacle now, and probably will be for a while because it is a one man show. I plan to post my results and some photos when I get it back and have shot it, because I really actually launched this project on this sight. You can email me if I can help at [email protected]. take care, flapjack