You may want to read some of the other posts, such as "powerbelt problems" that discuss working up a load. Using triple 7, I would drop back to about 80 grains and see how you group. Then increase to 85, 90, 95, 100 and see if you can get them to group better. With 777, anything above 80 should give you plenty of power. I would also try some other size bullets and see if they group better. However, 3" at 100 yards with a muzzleloader it pretty dang good! Sure there are guys out there who do a little better, but for most hunting applications with a muzzy, that is plenty good. I personally don't shoot at game beyond 100 yards. Of course, I only use open sights. Good hunting