Coldsteel: That is an outstanding example. I hope you approach load development with due caution, as I would hate to hear of anything going awry and damaging you or your very lovely double. For what it is worth, Baker reported using 10 drams of black in a No. 12, but does not give exact bullet weight. That seems like way too much powder to start with, even in a No. 11 with patched round ball.