The 17 HMR does about 2,550 fps and the 17 mach 2 does about 2,100 fps. Just as the .22 WMR is faster than the .22 long rifle, the .17 HMR is faster than the .17 Mach 2. Why they didn't just name the 17 Mach 2 the 17 long rifle to avoid confusion, I have no idea.
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The pond, waterfowl, and yellow labs...it don't get any better.
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