As I recall the 220 Swift fell out of favor due to barrel erosion issues. The 22-250 is far more common, even back in the 1990s when I bought mine. I have a Winchester Model 70 26" heavy barreled with aluminum bedded carbon fiber stock. The 22-250 will be easier to find ammunition and components for, and the Swift would only have a slight velocity advantage. You'll be happy with either cartridge if you find the rifle you want.