If you plan to keep it loaded, even overnight get into the habit of wrapping a rag or something around the flashpan or nipple so you know it's loaded. I've heard way too many storys of accidents happening when someone wanted to "just snap a cap" and forgot it was loaded. I've also seen split barrels when someone put one load over the other.

A 7yr old boy died in the house next to me due to a stupid iddiot cleaning a muzzleloader that still had a load in it.