Hi Two Dot, having just sold my 2-Band Enfield, I am contemplating replacing it with a Musketoon because one of my friends has one, and at shorter ranges it is much more accurate.
Having said that, I believe that the rifling on the musketoon is of the progressive sort ( tightens towards the muzzle) because of the shorter length barrel.
I think you will find that the real secret to accuracy is more to do with the type of Minie bullet you use (Deep cavity-thin skirt) to pick up the rifling.
I found the 2-band a little heavy to shoot off-hand as I got older, so I think I'll give the Musketoon a whirl!
Good luck if you buy it, UKshooter