Huge - You were right, thanks for catching me on that. The publication is from Guns & Ammo and it was a late '98 issue titled "Complete book of the .45". The specific article was titled "A Forgotten Powerhouse" written by Chuck Taylor. On page 65 I quote:
"Actually, the only load that produces recoil in either an M25 or M625 that is sufficiently noteworthy to preclude fast, combat-type DA work is the big 255-grain hardcast Keith #454424 SWC and 14.5 grains of 2400.
Intended to be used against large and/or dangerous game, it generates a whopping 1,083 fps from a five-inch M625 or 1,137 fps from a 6 1/2 M25 and shoots inside one inch at 25 meters. In fact, it duplicates the performance of Elmer Keith's recommended load for the .45 Colt cartridge used in a 7 1/2-inch Ruger Blackhawk-20.0 grains 2400 with the same bullet-with a much smaller case! For hunting elk, caribou and moose or "boondocking" in country where encountering potentially dangerous animals is a concern, this particular load excels, providing excellent accuracy, a full-caliber wound channel and fine penetration."
This article helped me choose the 625 over a 629.