Description

Gage pin sets from .17 cal through .50 cal.

Includes nine gage pins (.001″ – .005″ under bullet diameter in .0005″ increments) with calibre-specific Gage Pin Blocks with custom hole size per calibre.

Checking your Case Neck with Gage Pins:

 After expanding use the corresponding gage pins to confirm the neck sized as expected.  The feel you are looking for is a light drag on the gage pin.  When appropriately sized the gage pin will act as a piston as you push the pin into the case neck while holding your finger or thumb over the primer pocket.  You can feel the air compress inside the case.  Quite often the brass can be harder or softer than expected. By stepping up or down on the expanded mandrel bullet tension size, you can achieve the desired neck tension to your gage pin.