You must not be familiar with the Civil War sharpshooters. Most of the states had a regiment of 'em. Required accuracy to join up was tested at 200 yards, and as the war progressed, they didn't miss your head at 500 yards.
Some great battle stories of the roles various sharpshooters, though i'm finding it a bit difficult to sift through the internet for specific battlefields as examples without knowing their names to search for.
Rifle history will have to suffice:
"When paper cartridges which were sheared off by the gun's breech block and spilled powder in the action were replaced by linen cartridges, Sharps accuracy improved dramatically. All shots fired at 100 and 300 yards hit the target and there was only one miss at 500 yards."
The Sharps
...my employer held a 3 month long exhibit with daily speakers on Michigan's involvement in the Civil War... I'm crammed full of useless info now.