FatAlbert: "I" have a "lifetime" supply of 220 Swift brass for my mini-hoard (9) of 220 Swift Rifles so "my" 220 Swifts ARE all "good"!
The other 4 collector type 220 Swifts I own won't be getting shot by me but when I sell them in a year or two the new owners may have to look around a bit for loading components or ammo if THEY want to shoot them. I have seen both Hornady and Nosler 220 Swift brass on shelves in the past 6 months around here as well as want ads selling this in Winchester and Norma brands.
I guess if you (Winchester?) invent a cartridge you (Winchester) can decide to quit making brass or cartridges for it.
I have not heard that Winchester has quit either - have you?
Long live the wonderful 220 Swift.
Hold into the wind
VarmintGuy