Well a large caliber smoothbore is only going to be as accurate based on a few things; ball to patch ratio, patch quality, grease quality, and how clean the bore is.
The pedersoli Bess barrel is a very good taper for its undersized breech (undersized compared to the originals), and its a fairly good musket to hunt with.
Indian made muskets are hit or miss. Most are calibered at around .76, the problem I’ve seen with most Indian made muskets is that the tapers can be flawed and not straight. Once I removed the breech of a charleville by Veteran Arms LLC and the bore was off center, one side wall was thicker than the other, the barrel thickness was off on the left side by about .25 making it pretty thin on one side. Granted most Indian made muskets are likely bored correctly, I would have to say the pedersoli Bess is your best bet for an accurate musket ... however one thing I’d say for sure is that the .69 muskets (Charleville, Prussian and Austrian and Springfield 1816) will be more accurate than the .75 Bess.