It would seem to me you would want lube in front of the ball to lube the barrel prior to the ball passing thru although lube anywhere would be beneficial.
I shot ROAs for several years in SASS. I used 36 gr of anyof the following: 777, FFg, and FFFg. Use a .45 wonder wad, and a .458 or .457round pure lead balls. You can load black powder or 777 in the chamber as fullas you can and get a wad and the round ball in the chamber deep enough that thecylinder can turn when you pull the hammer back. DO NOT DROP THE HAMMER ON A CAPPED CHAMBER IF YOUHAVE A LOADED CHAMBER THAT IS NOT CAPPED!!! You can get a chain fire, more than one chamberfiring. Using a lubed wad behind the ball means you don't have to lube thefront of the ball. "HAVE FUN"