Hello,i've read this thread with interest as i have a Bisley SBH that i purchased for an indoor league up here.I recently chronographed 10 powders-10 rounds of each powder using the RCBS 250K cast bullet sized to .430 with Lyman Range Magic lube. My velocity results closely mirror what some of you guys have posted.My most accurate powders were Blue Dot,Green Dot,2400 and the most accurate was Bullseye.Surprisingly the least accurate was Trail Boss as i've had great results in .480 with it.My testing was done @ 20 yds,outdoors,partly sunny,60's.I tested HS-6,231,2400,Trail Boss,800X,Blue Dot,Green Dot,Bullseye,Power Pistol and Unique. The Bullseye load resulted in a S.D. of 4 and an E.S. of 11.The 800X and HS-6 loads were the least pleasant to shoot.