I don't have an inline....but I do use BH209 in my cartridges...it is probly the best powder for target loads in a 500S&W. Seems to work more consistant than Trailboss and it even gives some smoke.
I also use it in my remington 58 when I load 45colts in the conversion cylinder.
Maker of Horse Tack and Cowboy Gear.
Mister, why do you carry a 45? "Cause Sam Colt don't make a 46."