I've seen film of Howard Hill using a long bow on a lion, at a full run, across the path of the arrow. Perfect hit.
He was as proficient as an archer can get.
His work is some interesting reading for archery buffs. Well worth your time.
First make sure your gun is safe, remove the bolt and clean your barrel from the chamber to the end of muzzle. Clean the barrel using butchers bore shine until a patch comes out white. Run a total of 5 separate patches soaked with denatured alcohol through the bore and let dry for 30 minutes. Insert a cleaning rod with a jag and a dry patch into the neck of the chamber. Make sure it will stay there through the next process. Now using another cleaning rod, install a patch that has been coated...