When I moved to Indiana, I had the pistol magazine situation under control. All I needed were full-size magazines for .45 ACP 1911-pattern pistols, and I was golden. I'd sold the CCOs and Compacts, sold the .38 Supers and 10mm Autos, and long ago sold off all the Glocks and SIGs and HKs and whatnot; as long I remembered to throw an extra Wilson 47D in every order from Brownells, I was set on handgun mags for good.
I can't remember which came first, the Para LTC in 9mm or the Ruger 22/45, but suddenly there was another kind of magazine to keep in stock, to stuff in the range bag.
Then I switched from carrying the 1911 to the M&P 9 and all the 1911 mags, .45 and 9x19, moved to a plastic tub in the attic and the mag pocket on the range bag was stuffed with Ruger .22 and Smith 9 mags.
Then came the Glock 19, which meant Glock mags. Okay, don't need a bunch of those. Then, during the previous 9mm panic, I got that M&P 357, and I have to keep track of those mags too, but mark 'em differently and store 'em so they don't get mixed in with the 9 mags.
Then along came these various plastic guns that I'm trying out of curiosity and I find I've got a big Danner shoebox full of mags from FN and Walther and Glock and I don't know who all else... and, oh yeah, the extra mags for that little .32 double-stack Beretta... and I feel so... so... disorganized.