You don't have to slow your loads down - just tailor your bullet to the speed you desire. With that said, 1,450fps plus might be just the load you're looking for from a 500JRH and a 440 grain pill - plenty of recoil for any gunpowder junkie.

Don't put any stock into the energy transfer theory - just a marketing ploy - otherwise you would be seeing bodies flying through the air with the greatest of ease.