17 Mach 2 (HM2) Ammo

The .17 Hornady Mach 2, or .17 HM2, is a rimfire ammo cartridge introduced in 2004 by the ammunition manufacturer Hornady. The .17 HM2 is based on the .22 Long Rifle Stinger case design, necked down to .17 caliber and using a bullet weighing less than half what typical .22 Long Rifle bullets weigh.

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