2006 would be the date it was dropped.
It was dropped because it wasn't selling. I think it was brought out for us old farts and most of us have bought about all we can justify over the last 30 years or so.
The Swift has some issues due to the case taper and you have to admit that other than at the very top velocities it doesn't do anything a 22-250 doesn't do The 22-250 is far more popular among the general public and is chambered in a heck of a lot more rifles.
You will find 22-250 ammo in every mom and pop store in the country. Finding 220 Swift stuff is sometimes iffy, especially in smaller places and rural America.
If you do hot rod your Swift constantly you run into the issue of washing out the throat. Sure a 22-250 will to if run full bore constantly.
I have 4 Rugers in 220 Swift, a older 77 MKI with the light barrel that was used as a walking coyote rifle and another in the "V" model for setting and shooting rockchucks and such. I also have #1s in Swift, both the "B" and the "V". I shoot them quite a bit.
That being said if I was forced to choose between the Swift of the 22-250, I would choose the 22-250. Just more "STUFF" inc luding really good brass available and for all practical purposes it duplicates the Swift. In fact my 22-250AI runs right with the Swift without the case stretching.
The one that continues to amaze me is that fact that Ruger chambered the 25-06 in the early "V" #1s and still does. I like mine but the recoil is actually too high for a dedicated varmint rifle where 1000s of rounds will be fired in the course aof a single day.
Oh, well. glad I already have mine.
Ross