George, why not duplicate some long range historical shot(s) that was/were made?
From; The Frontier Rifleman - page 77
"I have many times asked the American backwoodsman what was the most their best marksmen could do; they have constantly told me that an expert rifleman, provided he can draw good and true sight, can hit the head of a man at 200 yards. I am certain that provided an American rifleman was to get a perfect aim at 300 yards at me standing still, he most undoubtedly would hit me, unless it was a very windy day..."
[Colonel George Hanger, To All Sportsmen and Particularly to Farmers and Gamekeepers, 1814