As long as I got good accuracy with the load I am sure the load you mentioned will be more then enough once the projectile is put in the right place. According to the manual 100 grains is the max charge anyway.

In my Mountain Stalker I have the best accuracy with 80 grains of Triple Se7en a wonder wad and a patched roundball. I tried some conicals out of mine but was not impressed with the groups after 50 yards with them. Are you using a wonderwad?