Remember modern rifle makers only stated 1" groups at 100 yds so 1.5" at 100 yds with stuffing it yourself is pretty good. My eyesight isn't what it once was but off a bench I still can shoot 1" at 100 yds, scoped of course with most of my rifles. Flintlocks, open sights, I accept 1" at 50 yds as ok for me. Most of my shots with a ML are under 100yds anyway. Good luck with the new bullet/combo.