Lemoyne said:

"I have a question, when I was trying different loads I also tried different powders When I got up to about 120 gr the777 started melting down the plastic on the power belts but the rs and the AP shot better with heavy loads I took the AP{FF} up to 150 gr and still grouped 2.5.
Does 777 burn a lot hotter?"

Oh my yes. By volume, T7 is 15% hotter. Pressure-wise it was probably like putting 200 grains of pyrodex pellets in your muzzleloader (assuming loose T7). Do you own a Savage? Or do you like taking risks?Please don't do that anymore.

Limit loads of loose powder to 120 grains. If T7 or BMag3, limit to 100 grains. Using big powerbelts? Limit your charges even more. Blackpowder is great fun until someone gets hurt. Remember, the maximum charges are only for light saboted bullets. Lighter powerbelts are just going to shatter on your game with maximum loads.

Happy Hunting, Phil