Mind your Fingers and the the Range of Motion.

The fellas I took my course through had tested us on everything.. pump-action, break, lever, single shot and semi-auto, pistol and revolvers.

I got points deducted because of ONE stupid thing.
Now, keep in mind: stupid + weapons = problems.
During a pistol inspection, the instructor couldn't see if my finger was on the trigger or not [it wasn't], and when I turned my wrist down to lay the pistol on its side and show the location of my finger, my movement caused the barrel to move about 2" outside the designated safe-zone-of-control and they nabbed me on that.