This week is a gunfight for those of you who like to argue about calibers. The .220 Swift dates to 1935, and it was the first cartridge to break the 4,000 fps barrier. The Swift has an old-school mystique about it, and also a reputation for burning out barrels prematurely that may or may not be deserved. The .22-250 started out as a wildcat about the same time the .220 Swift was introduced, and it was legitimized as a factory load in 1965. It, too, can top the 4,000 fps mark.