Playing on hardcoe mode, this can be quite distressing. You don't have a gun that uses that ammo type, but it's such a shame to see an ammunition box go unemptied ...
The mass of guns in NV cause this problem in me really badly. I find myself buying guns that my character can hardly even use, that uses the same ammo as my gun of choice that I actually can use, just to have it and look at it. I have also taken to collecting vast amounts of pre-war outfits, all of which I try out, trying to find the pimpiest for my Lady Killer sniper character.
Anyone else have tales of compulsive hoarding and kleptomania?
(oh and don't even get me started on Nuka-Cola, jesus christ)