If you're legal in using your gun what does it matter if there is a finger print on the brass? Your prints are on the gun and it week be no secret that you did the shooting...unless you do it for the reason of thinking it well affect the reliability of the round.
"They're on our right, they're on our left, they're in front of us, they're behind us; they can't get away from us this time."
Chesty Puller, USMC, Chosin Reservoir, Korean War
"You cannot exaggerate about the Marines. They are convinced to the point of arrogance, that they are the most ferocious fighters on earth - and the amusing thing about it is that they are."
- Father Kevin Keaney, 1st MarDiv Chaplain, Korean War