K&M - Custom Gauge Pin Size:0.2215 The steel core is coated

The steel core is coated with a high performance

All air-to-glass surface of Vortex Diamondback HD Spotters are fully multicoated with high-density (HD) extra-low dispersion (ED) glass elements to deliver high quality image detail with high resolution and light transmission

and pack full of fouling rending them useless

Solid steel

Push slowly through bore from breech end and out through muzzle

K&M - Custom Gauge Pin Size:0.2215 The steel core is coatedMeasures neck inside diameter 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 sized properly 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 actually feel the air compress inside the case. Quite often the brass can be