A conversation with an employee of the LGS drifted to all-things record keeping.
He passed along a tip he said he got from Massad Ayoob. (I have no reason to doubt the employee).
The tip is to keep in reserve a minimum of 5-rounds and the box of the self-defense ammo you carry.
In case you ever have to use your gun in self defense, having sample rounds might come in handy during the legal process.
What say you?