My old Lyman book generally cited a powder for a given cartridge as having the best accuracy with full power loads, but it isnt very good at 10mm. To narrow it down, lets make the slug either a 180 or a 200. I figure 180 as the best all rounder, but get a sense that the 200 might help smooth out the velos and tighten the groups. From observed velocity spreads, Im guessing its not BD, at least not when at full power under the 180. In the winchester sticky, there are good words about WSF under 180. Anybody?