I have a few handguns in unusual or obsolete calibers and, as a result, I have an almost spinal-reflex-level compulsion to buy ammunition in those calibers whenever I see a good deal on some. As a result, I have a few hundred rounds each of .32-20 and .44-40, purchased sporadically over the years twenty to fifty rounds at a time, despite only having a single revolver in each caliber, and one that gets shot extremely infrequently, at that.
The situation is even more pathetic in .22 Remington Jet: I probably have three hundred or more rounds of loaded ammunition, plus dies and at least that many more of once-fired brass and the oddball little Hornady 40gr .222" bullets, all for a gun I think I've taken to the range twice. But if I were trapped in Roseholme Cottage, surrounded by zombie squirrels, I'd be ready.
Of course, things are most off the rails in the old rifle department. At the March Indy 1500, I found myself seriously considering buying a box or two of Dominion Cartridge .577/450, despite still owning nine of the ten rounds of Old Western Scrounger ammo that I purchased shortly after acquiring my Martini, which is a creaky basket case of a wall-hanger whose bore mics out at .458" at the tightest spot and can charitably be described as having the pits arranged in a roughly spiral fashion (the sole round fired through it keyholed on the paper at roughly ten yards...)
By the way, anybody have a burning need for a box of Winchester .38-40? I used to have this dual-cylinder Vaquero, see...