IN ITS INITIAL FACTORY LOADING, THE .220 SWIFT launched a 48-grain bullet at a velocity of 4,110 fps and had a trajectory like a stretched banjo string. It was introduced in 1935 by Winchester Repeating Arms, into a world that thought the .219 Zipper was pretty hot stuff. It left them in the dust.
If velocity were everything, the Swift’s career would have been stellar. But velocity, it turned out, could take you only so far. A cartridge also needed a supporting cast of gunmakers, ammunition companies, and—above all—influential supporters. Alas, many of the influential men of the 1930s, men who wrote about rifles in magazines like American Rifleman, had reason to hate the Swift.
Several, such as Jerry Gebby and Grosvenor Wotkyns, had been involved in early development of…
