I have been following this thread with great anticipation. That is an awesome gun you have. How low is your gun printing below the sights. I ask this because I had a similar problem with a gun. I solved mine by loading a Duplex load. It was just enough of an increase in velocity to bring it up to the sight. I think it gave it that little extra umph. They say the old Bp was hotter than modern powder. That may be correct. Good luck with your gun.