I have owned a fair number of rifles, mostly 50 and 54 cal and one thing I have learned is that each gun likes its own bullet and powder combination. I killed one elk with a Maxi-hunter and was so impressed with accuracy and how it performed that I tried to make it work in other guns of the same manufacturer with the same twist only to be frustrated to no end. I would suggest picking a box each of several bullets and play with powder combinations until you find what you want.
