This is kind of a therory of mine. I think 'some' Riflemen of that period (AWI) & the (F&IW) most likely practiced (to a degree) some long range shooting, much like we do today,,, but ours is for pure fun and or expermintation, and perhaps a match or two sometimes. Back in the 1760's - 1780's it may very well have been a necessity for some to have some long range shooting skills.
What may have prompted the long range shooting skills of the 1760's - 1780's?
I'm thinking it was probably born out of the defense of fortifications when they came under seige by cannon, and or, Indian attack at places like Boonesborough, or anyother fortified settlement or out post up and down the frontier of that time.
I doubt the hunters of those days practiced long range shots on game. That would be to risky as it is today, but more so the reason probably being that back then you simply couldn't waste a shot on the frontier when you needed food, so close range shooting was the smart move.
However, long range ball lobbing at the enemy was all together a different story, especially if you could slow the progress of the cannons being moved forward,,, closer and closer to your fortification for a continual (more accurate) ponding on you and all the others held up in a fort.
It would also be a good way to possibly pick off a War Chief if you came under attack by the Indians. Take him out, or try and take him out, before he can lead the attack. Perhaps taking any enemy Indian out would be enough to encourage them to go away and not attack?
So I kind of think there was some long range practicing done by the better marksmen on the frontier, and done so with a military type mind set at holding the enemy at bay from the top of your fort walls for as long as you could.
I think once the AWI arrived the long range idea was just adapted differentyl towards the enemy, yet those making the long shots probably had some experience by this time in the art (if you want to call it that) of shooting long range.
Just some additional thoughts.