What is this?

bowhunthard88

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I'm pretty familiar with reloading tools, etc., but what the heck is this for? HAHA? I picked this up the other day in a bunch of stuff...
 

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That sir, is a Head Space Gauge, Set the adjustable guide on the datum line of an unfired case, zero the gauge, resize your case and it will measure the shoulder bump in your resizing die. Adjust your die accordingly to desired shoulder bump and you are good to go.
 
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