Blaster: Cannon -mania still has that chart ,but he is using Fg . On a 3in bore he is listing 4oz ,then says to cut in half for a ball load.
Using Cannon BP i have used 3oz on a ball load and it was fine ,i haven't pushed it farther than that ,but i have seen some who do.
I had a little 1in gun once and i used an ounce it it and i didn't have any problems,but it had a very well made tube.
The balls were cast from fishing lures ,but i was using Cannon grade being nearly two sises bigger than Fg.
Going by what you said ,in my full size Napoleon it would mean 1,1/2 ounce ,and i have used that ,but that load didn't even roll the gun back and wasn't real accurate ,useing CG powder.
2,1/2 was good ,and three was as far as i wanted to go ,all of this with cannon grade BP ,it was a good hard charge.
1,1/2 of Fg seemed to have nearly the same effect ,i wouldn't recommend using 1oz ,,using anything except Cannon grade,so South Bend isn't off base and is keeping it light.
In using the one inch to an inch of bore that has always been with Cannon grade ,what the charts are saying using Fg is correct within a safety margin.
I get my powder from Coonies explosives ,he has advertised in the Artilleryman Magazine ,Fg is basically for large bore muskets,and small Cannon. So staying with Fg powder i would stay with your 1/2 oz loading.
DD has chimed in on this ,and you are right about N-SSA and AAA, In 1995 it was hard to get any postings from them other than what you got at a shoot ,which around here came much later. I wasn't saying Cannon -Mania had better info ,They just had a quick reference chart and i was going to suggest he ask you or look at what these other organizations suggest when the prompt told me you had posted.