A very unusual hammer gun is in my hands. The maker is R. Scott on a jones under-lever 10 bore action. Sounds normal enough so far. Original 26&9/16" barrels, high dimensions, 1& 1/2" x 2", and a staight grip stock with an early rifle style metal pistol grip.This gun handles much more like a rifle than a shotgun. The only marks on the flats are 11 and 766, R Scott and crown and crossed lances over V, and what I believe ia a crown over BP. No rifling is apparent to the eye and barrel wall are pretty thin. I just swear this gun was designed to shoot ball of some kind. Any thoughts? Thanks,
Steve

I once owned a 12ga double rifle by Army and Navy. It had rifling that was almost invisible. Had to look at it at just the right angle and light to see. It was straight up the bore until the last 9 inches and started a slow twist. Also, some makers actually made what they called invisible rifling. Take another real good look. The .766 is about right for 10bore size ball.

have seen a 20 ga double with rear sigth where the the paradox part was bored smoth. this was done for gun laws many times in britain after ww2.