I did once; bought a 100 rounds of .44 Mag because I wanted a lever gun in that caliber. Well, I hit a road-block on the gun purchase and decided to trade the .44 ammo for some 7.62x39 at a local shop. The owner was only going to give me 5 boxes of cheap wolf 7.62x39 ($4 box of 20), I pulled my ammo off the counter at walked out with a pissed off look. A customer followed me out and asked me how much i wanted for it, and I said I'd take $50. He said to follow him down to the Sheriffs department to grab his money. I come to find out he is their firearms instructor and shoots a lot of .44 and was glad to only be paying $50 for almost $75 worth of ammo. Nice guy.
Then later that day I hit a public shooting area where I found 100+ empty .44 Mag cases that looked like they had just been fired. I took it as an omen and bought my first .44 Levergun a couple days later. Now I have two leverguns in .44mag, a SBH in .44mag on layaway, and 400 rounds of factory .44mag stashed away for a rainy day, and about 500 rounds of mixed brass (C.B.C & Winchester) reloads for my hunting/plinking ammo. I'm on the lookout for some .44SPL brass to try my hand at loading those for even cheaper plinking loads.