Frank, back when I was doing research for my varmint cartridge, the two it boiled down to were the 220 Swift and the 22-250 Rem. In the end I opted for the 22-250 Rem and was never sorry. Ammo is more available and even though the 220 Swift is suppose to be faster the varmints never know it. The 22-250 Rem is also dead nuts accurate.