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.17 HMR 10-22

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You also have to change the recoil spring and add mass to the bolt in the form of a heavier bolt handle. Timing is critical with this very snappy caliber and you need to slow the bolt to insure no OOB ignition which can result in a ruptured case. Which in turn can result in a magazine going KABOOM. If the bolt begins to open too fast (which it would with just a barrel change) you will expose unsupported brass while the bore is still under pressure. Approach these conversions carefully. It's best to buy a complete kit from one provider to insure properly matching parts.

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