Originally Posted by john traveler

The previously mentioned accuracy problems were with three samples of older .45 Colt caliber S&W M25 revolvers. They gave excellent/very good accuracy using factory 255g RN factory lead ammunition, and after the conversion gave only mediocre .45 ACP accuracy using factory Federal Match 230 FMJ ammo. It was never determined whether the difference in accuracy was due to oversized chamber throats or the 1/2" "jump" of the shorter cartridge in the longer chamber. I can only state that I would not be interested in converting my .45 Colt revolvers.