I keep track on a couple of Glocks I shoot all the time, mainly to see how long they will go before things start to break.
Other than that, I usually dont bother. Although its usually not to hard to figure things out if you shoot them on a regular basis, and know what you shoot when you go.
"If the rule you followed brought you to this,
of what use was the rule?"
“The enemy is anybody who's going to get you killed, no matter which side he is on.” - Joseph Heller