Probably using 700 grain “boattail: bullets. I think that the bullet drop at 1,500 feet is about 32 feet.
A mite a Kentucky windage and a bit a holdover fer distance, and ya got it!
Remember Billy Dixon. In the 1870s, at a place called Adobe Walls in Texas, a group of buffalo hunters was trapped in an abandoned mission by a band of Comanche Indians who looked forward to slitting them from crotch to brisket with a dull deer antler. Things looked bad for the hunters until one Billy Dixon shot the Comanche leader dead at what was probably close to a mile, and the rest of the war party remembered they had pressing business elsewhere. Dixon made this shot with a .50 Sharps buffalo rifle, which hurled a lumbering 500-grain bullet at roughly 1200 fps. Instead of a scope, he had a peep sight called a vernier sight. Rangefinder? Nope. Ballistics program? Nope. Shooting experience? Plenty. Incentive? Loads.