Muzzleloaders are NOT centerfire rifles. What shoots great in one rifle may not shoot worth crap in another. You will have to try different bullet/powder combinations to find the sweet spot on your rifle.
And you don't have to start with magnum loads (and 120 gr of 777 is a magnum load). Try starting at 90 gr and shoot three times, then 95 gr, shoot three times, 100 gr.........up to about 110 gr. And you will have to try some different bullets.
You don't need over 100 gr of any powder to kill anything walking in America. My elk load is 90 gr or 777 or BH 209.
It may take a lot of work, but will be sweet when you find your rifles sweet spot! If not, you can send it back to T/C and see if they can get it to shoot. If they can't, they will give you a different barrel.
Last edited by txhunter58; 11-07-2009 at 05:57 PM.