A good base is 1-2 thousand, as 74 said, probably a bit more for .22lr (which is a calibre everyone should own a rifle in, especially for SHTF).
But as 74 said, you can never really have enough ammo (and reloading supplies). With the shotgun ammo, I have 1/3 of it in 00buck, 1/3 in slugs, and the other 1/3 in assorted stuff, such as smaller bird shot, that’s what works for me.
Canadian Patriot. Becoming self-sufficient.