I have had really good luck with powerbelts.
If you load 100 grains of 777 pyrodex pelletsuse 245 grain powerbelts aerotips.
If you load 150 grains of 777 pyrodex pellets use 295 grain aerotip powerbelts.
This combination has worked great for just about every muzzleloader I have tried it in. I own a TC Omega, TC Encore, and a TC Firehawk, and have a CVA Wolf on the way that I just bought to try.