When I loaded BP and still load CleanShot/American Pioneer BP sub in shotshells,,I always use the same scoop for the shot and the powder. Same VOLUME of each component.
It's always been a decent rule of thumb for a good all around load in BP shotloads and if the sub is a vol to vol replacement powder,,it works just as well.
Choose the shotload (oz) you want, make a scoop that holds that weight of shot.
Use the same scoop to load that same volume of powder in BP or the substitute.
Adjust the height of the load in the shell by adding to or deleting from the filler wads if you use lighter or heavier loads.
