I purchased my Pedersoli Brown Bess Carbine about the same time Rifleman mentioned above. The bore size was .753. For an accuracy and hunting load, I used a .735 Ball (the largest available in those years) a thick ticking patch around .020" and 70 grains of FFG Black Powder. I could consistently hit a one gallon milk jug when firing offhand at 100 yards with this load and the hit ratio I got was 8-9 times out of 10. Had I used a rest of some sort, the hit ratio would have been much closer to 10 out of 10 times.
To give some idea of how effective my load was, my round balls weighed about 598 grains and compare that to an UnCivil War Minie' Ball of about 500 grains. The UnCivil War Powder Charge was 60 grains of Powder with that 500 grain Minie' Ball. IOW, my load mentioned above was more than capable of being effectively used for at least Deer sized game. I may have kicked the powder charge up a bit if I was hunting Elk or Bear, but I never hunted them with my Brown Bess, so I can't say for sure.
Gus