Just visited with a friend that has a rifle in both .17HMR and .17 MACH 2. He said go for the .17 MACH 2 as it leaves less of the gopher to have to pick-up. He loves both and both are from CZ.

Sorry, I can't be of more help. Let us know how it works out
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I do the things that I must, and really regret, are unfortunately necessary.

RIP OBG