Interesting story. Even after the war union troops were looking for Hinson. It all started when Union soldier executed his two sons and placed their heads on the family gate posts that Hinson started killing .
The technology for making accurate heavy rifled muzzle loading had been known by then for a long time. I am wondering if those were the original sights. I doubt that fixed open sights would have been adequate for what he was doing. The displayed rifle had been through a fire.WOW. I've never heard this story before. Looks like the barrel is rifled which would account for the rifle being accurate to that distance.