using 777 here in pellet form and found something interesting yesterday the advertised power increase is as usual hog wash two pellets of 50 grain 777 give a 300 xtp 1714 fps two pellets of 50 grain pyrodex give 1804 tested three times same gun same bullet and sabot just slower though very much cleaner!!! i'll take the slower pace for that but to your dilema i am shooting the shocwave by tc in 250 grain with two pellets of 777 and getting 3/4 inch group at 50 yards no fliers even at hundred its dead on my only concern is bullet expansion but we'll just have to wait and see i've heard that the muzzloader has tendancy to be inacurate for tc's quality control if its new and won't shoot maybe call them up who knows anyway thats what i use good luck