Just thought I'd throw in my two pence here. My Howdah pistols like 30 grains Goex with a patched .610" ball, but I've taken them up to 60 grains. I've also gone up to 1 1/8 oz. shot with an equal amount of powder.
Now before everyone calls me a nut and takes aim at me, I don't do this all the time. In fact, it was only when my Howdahs were new and I was "learnin' 'em." I didn't try these loads because I wanted to 'push the envelope' or because I wanted to make an awesome youtube video. I simply wanted to see what sort of accuracy I would get and how manageable the recoil would be with heavy loads, and thus determine what would be the practical limit. The accuracy was nothing to write home about (much better with 30 grains) and the recoil was manageable, but not pleasant. So I got my answers.
The point is, I was just testing performance at different levels, and the wood didn't crack, my hand didn't break, I still have all my fingers, and the recoil didn't flip the pistol over and pound me on top of the head and drive me into the ground like a fence post.
If that's what I was trying to do, I would've used 100 grains. :grin: