smoothshooter
50 Cal.
Yea I have loaded some stout shot loads, yesterday for the hell of it I loaded 120g FF with and over powder wad and card, then 3oz No.4 Shot and and over shot card. It digested it and blew it out fine. I loaded it 5 more times like that.
I would back that load off to about 90 grains of powder and no more than 1 1/2 to 2 ounces of shot or a single ball.
Especially with an Indian gun.
A steady diet of proof loads will lead to trouble.