The .219 Zipper / 5.7x49mmR cartridge was created by Winchester Repeating Arms in 1937 to be used in their lever-action Model 64 rifle.
While the .219 Zipper was supposed to compete against other varmint cartridges of the time, most lever-action rifles use tubular magazines, which prohibit the use of pointed bullets.
Leslie Lindahl's Chucker and Super-chucker and "wildcat" case modifications by Hervey Lovell, Lysle Kilbourne, and W. F. Vickery offered similarly superior ballistics in stronger single-shot and bolt actions.
[1] Though the flat- or round-nosed slug causes rapid loss of velocity, the .219 Zipper is suitable for small game or varmints, including wolf or coyote, and even deer if loaded with a heavier 55 grain bullet.
The ballistics data in the infobox are for maximum loads, as determined by the writers for Accurate Arms.