Scrap the 777 and try real black powder. No need for 209 primers either. Real black powder ignites very well with # 11 percussion caps. I shoot PRBs in my T/C Hawken, good results, and no fouling problems. Goex, # 11's, .018" pillow ticking patch, .530" roundball, (it is a .54 caliber) Hoppes # 9 Plus Lube. Also occasionaly shoot T/C Maxi-Balls, lubed with NL-1000, again, no fouling problems. IMHO a T/C Hawken is made to shoot real BP, use percussion caps, and shoot a round ball, or conical. Once you try the real thing, you will be pleasantly surprised !