My experience with my new Pedersoli Bess is that the bore diameter is exactly .750" - my original India Pattern measures .753".
The original likes the .715" ball for paper cartridges, and I can shoot up to 20 rounds or more without significant difficulty with built-up fouling making loading difficult - this is not the case with the Pedersoli: for whatever reason, it becomes difficult to load the .715" paper cartridges after only 2 or 3 rounds. I'm going to acquire a .690" mold for the new Bess - that is the diameter of the original British rounds, and should make loading easier. I expect it will shoot well, also.
The .735" ball makes for a tight load in the new Bess, and requires a thin patch and water-based lube for good performance - neither does it shoot better than the .715" ball with a thicker patch, which is considerably easier to load, or the paper cartridge with the same bullet. I do not think the .735" ball will work at all well in paper cartridges, unless you remove the paper wrap completely from the ball in loading.
Good Luck!
mhb - MIke