I bought the 10 gauge "Parker" hulls and proper size wadding. Found an original loading set on e-bay, even had the box. I found that the 3 1/2 dram powder setting on the dipper delivers 1.2 oz of #6 and 75.4 gr Black MZ (by wt.) or 2 3/4 dram. Given that this substitute powder runs about 15% "hotter" than holy black in my experience, this seems like a reasonably conservative load. I fired 4 rounds yesterday at a target board set at 40 yards. With this heavy gun, there was not much recoil, but the full/xfull barrels peppered that target with a nice even pattern. Looks like I have a vintage turkey gun. Thanks for all the very helpful input.
