And B. How much is a good cushion where you feel ok to shoot some of it and not feel......bereft?
I've committed to keeping a few month's worth of range ammo, and 3-4 refills of SD ammo on hand
As examples:
Range ammo for centerfire pistol-
(~50 rounds/trip) * (~3 trips/month) * (3 months) = ~450 rounds stashed
If the hoard gets below that, I start to shoot less centerfire pistol, and more rimfire ... the determination is similar for centerfire rifles or shotguns
SD ammo for CC pistol
my CC - 6+1 with a 7 round reload = 14 rounds per refill
MrsBFD's CC - 13 and a 16 round reload = 29 rounds per refill
So I'm trying to get up to ~129 rounds of SD ammo on hand, but I'm not quite there yet, so I rarely expend SD ammo
rimfire hoarding
When I see rimfire that my semi-autos like, I buy it and stash it, when I see rimfire I'm not sure wether my semi-autos like, I buy some and test it, what won't work for semi-autos can be fired in either the Henry lever rifle or the NAA revolver, they aren't picky
When I see Remington-branded rimfire, or other stuff I know the semi-autos don't like ... I leave it on the shelf