I wouldn't pay much attention to ft/lbs. of energy. Do you load your own? If so, I would suggest a good 300 gr. hard cast bullet from Cast Precision or the like. Or, you could load up the Hornady XTP 300 gr. but make sure you don't buy the MAG version because that one is designed for 454 Casull velocities.

If you don't load, I would look at hard cast loads from Buffalo Bore. There are multiple companies that produce +P 45 Colt loads in both hard cast and jacketed.

Now would be a good time to look into loading if you don't already.