I was going to suggest WC820 or WC 297, but I see neither Pat's nor Bartlett's have either one. Both have a burn rate similar to H-110/296. Other than AA#9 or 4227, Longshot might be another powder worth trying. Works fantastic in 10mm. Then there's Blue Dot. 800X does work, but I can't get it to meter through a Dillon or a Lyman measure. I was given a pound of 800X, but that will end up measured and weighed out the old fasioned way -- one at a time.