You go to the local outdoor range after hours to scour the lanes for brass you can reload.
You always check the brass bucket at the indoor range for the same reason.
You find boxes of ammo to guns you have never owned, or have traded of or sold while cleaning out your car's trunk.
When you watch the news reports from war zones, and see all the brass just laying on the ground, you wish you could go over and gather it up to reload it.
You go to the local WalMart to get cheap shot shells for trap, and decide to check the rifle and pistol ammo. While there, you ask if they have 7.62X54R or 7X57 MM, and the clerk tells you that hey don't sell military calibers, you correct him.
You respond to someone asking wether they should buy gun A or gun B with, " Why not buy them both?"
You get Christmas and birthday cards from your LGS and at least 5 firearm manufacturers.
The owner of your LGS calls you to tell you to come down and check out the new guns he just got in.
You can name every cartridge that can be fired from a Medusa, and you don't have to look it up in the manual or ask Trez.