Check the twist. Most of the Hawkens from T/C were one in 48 inches which will usually shoot the Powerbelts. I would try some of the Great Plains lead bullets also they usually shoot great in slower twist barrels. Buffalo Bullets has a number of solid lead bullet and Ballets also. What caliber. Mine is a .54 but I bought a drop in .50 barrel from Green Mountain which is another option for about $160 you can select any twist you want and get a barrel from them set up that way. It comes complete with nipple and ramrod set up to just drop in the Hawken. Mine fit great. Had to do a small fitting of the thimble rail as it was about 1/8 inch too long to fit in my stock. I did the opposite and set mine up to shoot round balls for competition. If I was going to hunt elk with mine I would go back to the .54 barrel and find a Great Plains bullet that would work (possibly try the Powerbelts which I have shot elk with in my Omega).