Winchester Varmint High Energy ammunition was developed as a hard-hitting, high performing line of rimfire ammunition for varmint and predator hunters. Varmint HE ammunition delivers excellent terminal performance producing quick, humane kills. The revolutionary 17 Winchester Super Magnum is the fastest, most innovative rimfire cartridge ever developed. Based off of a 27 caliber power fastener blank, this cartridge produces centerfire velocities and energy in a more cost-efficient rimfire package. Hornady's V-Max Bullets feature a polymer tip which enhances accuracy and promotes devastating expansion. The tip raises the ballistic coefficient for faster velocity and also acts as a wedge, initiating bullet expansion. The flat base creates in-flight stability for long-range shooting. Hornady's swaging process creates precise formation of the core around the tip of the bullet, creating a build-up of energy which contributes to its phenomenal performance.