EN4CER,
There's a somewhat famous story in Arizona about a Border Patrol agent that got involved in a prolonged shootout with some bad guys. After the fight was over, it was easy to determine how many shots he'd taken. Because every time he'd reload his wheel-gun, he'd dump the empties into his hand and and line them up on the hood of his Ramcharger. Just like he'd do every time he'd go to the range.