I have 4 OM 357's I'm going to convert to "something". I have kicked around the 41 mag and 10mm a bunch but keep running into mental road blocks. The 10mm won't gain me much if anything over the 357 and the 41 mag won't gain me anything at all over the 44spl or 45colt in that platform. A good .410 barrel blank isn't easy to find either. Granted, I have no experience on game with a 41mag but the 44spl will do 1200fps with a 250gr and the 45colt will do 1100fps with a 300gr. I just don't think the 41 will come close to either in the 23k psi range.