Gil Sengel came out with an article on a Martini he'd put a heavy 12 bore barrel on and developed round balls for.
; This came out some years after I'd done my 'work' on the subject. He ended up using the gas checks off the bottom of wads as well, and as well, his results were similar - wonderful accuracy from a smothbore. This would have been a handloader magazine. One of the forum members here, copied the article and sent it to me- I enjoyed reading it very much - almost like going through my own notes. It now resides with my notes on loading balls in the 12 bore.
: I ended up with around 10" groups fired offhand at 100 meters. I could just stay on a 12" steel plate hung at that range, so that's the goal to beat. Due to the recoil with black powder loads to 7 drams, I didn't shoot off the bench when testing loads, but used a standing rest position to help absorb recoil. Smokeless loads didn't kick much at all, in comparrison to black - maybe 1/3 the felt recoil.
: 27.3gr. per dram.