There are certainly many members on this board that fire miniature artillery pieces, and judging by some of the questions that they ask here, it would seem like a lot of folks are interested in learning more about powder and shot, with the goal in mind of achieving greater accuracy; so why aren't more members participating in the two (small and larger bore) annual postal shoots?
I sure don't have the answer John, wish I did.
It is kind of a challenge to figure out how to do it and it does take time to shoot the 12 rounds required.
You did a good job figuring it out. Others can to.
Maybe folks like you and I should focus a little more on loading and load development and post our results on the board.
The guns you and I shoot would make good platforms for load testing.
My SAMCC gun is 50 cal. Track of the Wolf lists 7 different type of 50 cal balls from .580 to .500 diameter, an great number of patch styles as well as a slew of card, fiber and felt wads. Lots of stuff to play with.
We don't have to wait for others, we can just do it. If we show folks how easy it is to do, they will join in.