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NO, the .17 HMR and the .17 Mach II are not interchangable as the are made on differant cases.

The HMR is based on a necked down .22 Magnum while the Mach II is based on the .22 long rifle.

Ruger, Taurus and Heritage all make REVOLVERS in 17 HMR to name a few.

Hope this clears things up.
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