There is only a common usage of "Long" in "Long Colt"
The correct term is .45 Colt.
The .454 Casull is a hotrodded and modified .45 Colt.
Factory loads of .45 Colt are sweet to shoot, easy on one's wrist and hand.
As far as making a .45 Colt more powerful than a .44 Remington Magnum...sure you can...but why??