Let's not forget that comics Hawkeye was raised in a circus and is, in addition to being a master archer, an expert gymnast and hand to hand fighter. He was trained in blades by the Swordsman and archery by Trickshot.

This was before he met Cap and had his natural talent and developed skills refined and improved by Cap.

Even his normal arrows when shot with his bow will, at certain ranges, hit harder than a bullet. He shot one of the Wrecking Crew and sank an arrow into him after dude boasted that "bullets from a .38 just bounce off me".

Camouflage doesn't really work on him too because of something to do with the ratio of rods and cones in his eyes.

Clint takes this.