What I used to keep and what I keep now are 2 different things
I always kept a bundle of .22LR on hand because the family uses it heavily. Also because I had friends who owned an LGS, and I made it a point to buy something every time a I walked through the door. It added up bigly
I hadn't loaded for handguns since the 1980s, until recently. And my handgun world has expanded. 10 years ago I had a 1911 .45, a K frame .357, and a J frame .22. Things change
Still, the only CF handgun ammo I keep any real stock of is the 9mm
Until 2018 or so I hadn't owned a 9mm handgun since the early 80s. When things took a turn towards sanity after 2016, I recognized an opportunity and bought 9mm ammo right.
8-10 cents per round
Most of my rifles I try to keep 100 rounds loaded and ready. Components to keep that going comfortably
The 25-06 I keep Nearly 300 rounds loaded (2 different loads)
I lose some brass hunting, and don't feel any pressure yet to replace them
