I never could get my TC Hawken to shoot great groups with 777FF. I shoot round balls, PB platinem 338gr, TC maxiball 370gr and precision conical 390gr. With Goex FF I use 80gr for a round ball, 90 for the PB and 100 for the rest for the best accuracy. I also don't shoot over 75yds. The 777 works great with the inlines but just never could get it to shoot to my liking with the Hawkens.