I am a lifetime shooter/ hunter. I certainly do not "hoard" ammo, like you hear so much about, but when ammo is scarce I am smart enough not to keep blowing it off just for entertainment sake. Thus, for my primary rounds at any given time I have at least a couple hundred rounds OR because I reload for almost everything, I have components four a few hundred or so. Just my lifetime pattern...but seriously speaking, if there happened to be a real long term shortage, I probably wouldnt have to worry about it affecting my hunting / routine sight in practice.
That said, For my anticipated and realistic hunting /self defence scenarios, I have chosen to keep/ obtain several calibers in popular common cartridges that expand my access. My thoughts being that as opposed to limiting to only a small number of cartridges that may potentially become for whatever reason unobtainable, a wider range of calibers will offer more access. Thus, My long term favorite cartridges are 8x57 and .308. On the fringe occ. used, 45-70 and 30-30. Recently obtained or retained but well stocked/ reloaded...270 Winchester, 22-250.
Currently being focused on....my black powder arms. I have three calibers, .58 (shooting cast Minies), .54 cap and ball, and a 50 inline. I have focused on them a bit as far as tuning actions and sights, obtaining black powder and caps, etc. Surprisingly, black powder and components are much more readily available. And worse case scenario......Black powder can be made at home, effectively and legally. Caps can be improvised, and for my flintlocks...god made plenty of flint.
Sooo...not actively consolidating, not so much expanding what I had but reinforcing, and more fully utilizing what I have.