Winchester Varmint Rimfire in 17 WSM is the world’s fastest rimfire cartridge, engineered to push the limits of performance for small game and varmint hunters. Firing a 20-grain projectile at a blazing 3000 fps, it delivers 400 foot-pounds of muzzle energy, outperforming all other rimfire options. This cartridge provides 2.5 times the downrange energy of the 17 HMR and delivers a 50 percent flatter trajectory with significantly reduced wind drift. Designed for pinpoint accuracy and maximum impact at extended ranges, the 17 WSM is the top choice for serious rimfire enthusiasts. Each box includes 50 rounds.