300 wsm reamer

HANDLER

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i purchased a 300 wsm reamer from a member,,,its marked,,,300 wsm ,,fin,,,.339 nk,,,.149FB I understand all buy the star thing that screws in the end??do i ream a chamber with the star thing in the end????thnx
 

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You need a bushing on there before you go to making chips
 
The retaining screw, (the star thing) is cut to allow coolant/cutting fluid to pass through the pilot bushing, when using a muzzle flush system.
 
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