how about a .45 Super- 460 Rowland- 45-08? Same firearm but much more power. I know a pistolsmith in Prince George B.C., that has built several 45-08's for people for bear protection sidearms. He uses cut down .308 cases and loads the snot out of them, I think he gets well over 1200 fps with 230 gr jsp's and swc's.

He recomends Norinco 1911 frames for this, they are tougher than a woodpeckers lips!(5100 series steel.)