This was tried at one of the early 3 gun nation pro events, very good idea but unless you provide some training and a lot of guidance it can be a real mess. Everything was painted except the targets. Don't get me wrong I think it's a great idea, but how many shooters that know what's going on...
Like I said it came up in conversation with some one wanting to add a dovetail sight on a shotgun that was shooting slugs several feet off. They just questions if there would be enough adjustment, so I had a spare moment to figure it out.
This question came up the other day as far as how much adjustment was needed in a dovetail rear sight?
7" sight radius at 25 yards requires .09406" to move 12" on target.
20" sight radius at 100 yards requires .06704" to move 12" on target.