I’m strongly tempted to get into ammunition reloading. Prices have been rising higher and higher, and if nearly all of my shooting is just for practice then even Wal-Mart 100-rd packs of Winchester White Box are pretty expensive. Other than a Marlin 336 in .35rem that I never shoot and already have plenty of rounds for, I pretty much only use common military calibers: 9mm, .45acp, .223, and 7.62×39, plus .22lr, .22wmr, .38spl, .357mag, and .44mag. .22lr is too cheap to gain anything by reloading and .22wmr is not only probably a pain due to its size but I also hardly ever use it, having only a NAA Mini-Revolver chambered in it. I doubt I go through even 50 rounds of it per year, and since the Mini-Revolver has a .22lr cylinder I mostly just use that when I feel the need to practice with it.
The revolver rounds are more of an issue, although I hardly ever shoot .44mag, having only one gun chambered in it. The .38 and .357 rounds might be worth it, though, especially since I can dump the used casings straight into a bag, rather than hunting around on my knees in the dirt.
Apparently you can get reloading setups for well less than $200, and if I can save about 50% on .223 and .45 costs then it’s probably worth it. Time is something that I don’t normally have a lot of, but having something mechanical to do can be pretty calming and a good relief from academic work.