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In short, no. The .17 Mach 2 and the .17 Hornady Magnum Rimfire are two different cartridges- they just happen to both have a 17 in their names. Only use the caliber of ammo that is stamped on the rifle. When chambered in a .17 HMR rifle, the .17 M2 will either not fire at all, or will split the cartridge casing on firing. The HMR has a larger case diameter and length than the M2.

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13y ago

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