huntsman,

Thanks. I'd heard about the Superformance too, especially since the factory ammo boxes say "Superformance" right there. But in the Hornady loads Superformance isn't one powder, but specific blends for each cartridge, and I am pretty certain the Superformance powders used in the blends are made in the same factory as 1680. Will try it and see! I have plenty of both Li'l Gun and 1680, as well as Reloder 7 and Vihtavuori 120, which might be worth a whirl as well.

Thanks to everybody else as well!

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck