It's not too bad not seeing deer in the BP season. Shot a couple during the regular WI firearm season and hunted MN firearm season too. Starting to get my fill of hunting for one year.
So you shoot pellets for powder. Looks like your at 100 grains. I shoot 90grains of Goex loose powder. Still trying to find a round for 100yd accuracy. Shooting T/C maxi balls at the moment. Used T/C maxi hunter too. Both rounds kick like a son of a gun. Powerbelts don't work very good in my gun. Has a good enough twist in the barrel, but the barrel is very short. I think that's most of problem on the longer shots. I have some Hornady Great Plains rounds that I need to try yet. 385 grain hollow points. Picked up a bag of Wonder Wads. They're 1/2" wide, thick wool, that goes behind the round and seals the grooves in the barrel. Suppose to help for better accuracy. Haven't tried those yet either. Need to do some messing around next summer and find a good combination. The beauty of BP. Different rounds, different powder charges can all make a difference.
Right now I'm using 2 50g pellets of Triple7 magnum with a T/C Shockwave Sabots. This Wednesday I am going back to the range and trying out the load Bob_VT uses, the Hornady XTP 300g I'm also going to try the 320g maxi ball and see what works best with the gun.
Yesterday I was having a bear of a time loading a 2nd round without patching 1st that really wouldn't work to well if I had to try to get off a 2nd shot in the woods
Initially I thought it was because the 777 was a dirtier powder, after doing some research on the net last night I found that the Shockwave is a harder bullet to load. Thompson even states to 1wet-1dry after each shot with the round
The gun has a 28" barrel
Here is a pic from the T/C website and a link to the gun
T/C Triumph