Renegades are sweet. I love my old .50 caplock. Ok, first thing, even with everything perfect, Pyrodex is still hard to ignite in a sidelock, so I imagine 777 will be also. I have only had 1 misfire with using Blackpowder loads and maybe a few hangfires, but with Pyrodex, many more, don`t use it anymore. If you are going to use Pyrodex or 777, may I suggest one of the hotter optional nipples available and also use #11 Magnum Caps, this should help. I have only used stock nipples and regular #11 Caps. Even though I only use Blackpowder now, I am going to switch over to a hotter nipple and the magnum caps. A good starting load for these guns with maxi balls is 70 gr. Pyrodex RS or Select and work up from there, usually topping out at 100 gr. After that, is probably overkill.Myself, 90 gr. is nice, powerfull, yet accurate. Jack.