20.0 - 20.5 grains with AA Hulls, Winchester primers and standard Fig 8 or WAA12 Wad. Check the data at Alliant's site for your EXACT components before you load anything. The above will get you at or a bit over 1200 fps, depending on your barrel. Be sure to weigh your drops! Federal Hulls may require just a little more.
Pheasantmaster (Martin W) shoots 19.5 gr Green Dot in AA hulls for handicap. I shoot 20.5 gr of Green Dot in AA hulls for handicap. Both he and I shoot from the 27, but he typically shoots higher scores than I do. Could the difference be due to the shells or is there something else involved?
Mental, Maybe.....Power?.....NAaaaaaaaH!!!! It's the magnetic shot being attracted to the iron content in the targets. That happens when you drop your shot from those new wheelweights marked "Fe". Tough to melt, but boy is that shot hard!