Thread:Dentface/@comment-4903648-20120430181910/@comment-1140008-20120430191945

The amount of damage dealt on an enemy has many contributing factors. The attack of the Weapon you are using, the skills and boosts that weapon may have, your level, the rank of the skills the weapon type you're using has, and timing (not mashing buttons, but clicking at the right time so you don't get the "Mistimed" message) Ammo may make a difference as well.

That is pretty much the logic of it.