I project a normal charge for that deuce bore would be in the 20 to 25 dram range. That's 546gr. to 683gr. of 1F or 2F. I don't think I'd ever want to see someone attempt that. I don't think the stock would bear it, let alone the shooter, for that matter. It is doubtful if you could hold it in both hands, waist high and fire that much powder.
: Have you shot it, bigdog & if so, what load - 10 drams?