Is this a .45 or a .50cal? If it is a .50cal I think you will find you were overdriving bullets too short to take advantage of your rifles twist. I notice your groups got better with the 240g bullets so I suspect a .50cal rifle.

Try some 250-300g bullets with the same loads and report back to us. You folks who own chronographs are a muzzleloaders best friend.


Thank you very much for the data!!!!