In Colorado we have a 500ft lbs regulation that knocks alot of cartridges out of the game. Cor bon is making some loads for the 45lc that are really hot. 300gr bullets at 1350 fps. But they are horrible on recoil. And I would suggest only shooting them in a S&W or a ruger. I believe they would turn a lesser gun inside out eventually.

I also have problems shooting my revolvers off a bench especially when the butt of the revolver is touching the bench. Or should say my hands are resting on the bench. Just a theory but I believe it has something to do with distance from eye to sights when shooting from a bench then going to an off hand stance. On a bench you may not be at the same sight picture everytime.