I've tried all kinds of different loads from maxi balls homemade and factory, powerbelts, greatplains and even round balls. Mostly I've shot Triple 7 and Pyrodex through it. 70 to 100 grains.

A first I thought it was my sight picture and not having the same position on the stock. I was convinced enough to buy peep sights to eliminate error to a minimum. Well that wasn't it. It's not sight picture at all and I had a gunsmith match the peep to the globe for height.

One thing I forgot to mention was it's already busted one stock from just firing it. Not that would be a issue but it could be if the barrel is drilled off center. One thing I'm going to try is to shoot it upside down a few times I should get the reverse effect. I'm sure this will get inventive to figure out how I'm going to do just that. I just if it is what I'm thinking it could be then I guess I'll ship the barrel back to Thompson. I'm also going to do what cyugad said and go for the 50yd range first but I believe I did that before new sights were put on it.

The accuracy of it at 100yds is every round with in a 3 inch circle. Considering what it's doing at 50yds I didn't think it was doing too bad at 100yd. I've shot better groups with my Lyman but the issue isn't how well it's grouping but it's radical difference in trajectory.

I've even put wads between the powder charge and the bullet thinking I was losing severe velocity. That doesn't seem to be the case. I've cleaned it and cleaned it and cleaned it. I've ran more loads through one muzzle loader in 10 years and never cleaned it that much.

Alot of good ideas and I'll try a few before letting Thompson have it back. It's became a challenge at this point. Thank you all