On the other hand, the American frontiersman was prone to estimate the range and take a "fine" or "coarse" bead if necessary to allow for the distance.
I got to thinking about this, and it occurred to me that, generally, until we reach the era of cartridge firearms, field adjustable sights were pretty rare things.
Even today there are many guns with fixed sights. (and I count drift adjustable as "fixed" cause you aren't likely to be able to adjust them in the field)
SO, the only way to "adjust" for distance is taking a different sight picture.
Compared to muskets and fowling pieces, (shotguns) the Kentucky rifle had great sights. But compared to modern ones, they aren't great. They don't move, so one takes a different sight picture (bead fine in the notch, or front sight standing proud, etc) or one simply "holds off" the amount needed in order to hit.
"Kentucky windage" isn't just about left/right due to wind, its also up/down, and any other way you need to hold off in order to hit. (I hve no proof, but i don't think the term came from Kentucky I think it came from the way one used a "Kentucky long rifle". Most of which were made in Pennsylvania, and used everywhere, when Kentucky was the frontier.