This is a great little tool that not only shows the precise amount of run out between the case and bullet, but also helps you gently and accurately tweak the two into correct alignment. Helps you improve round-to-round consistency for more consistent groups. By rotating the cartridge and using the lever adjuster to push on the side of the neck that reads “high” on the indicator, the cartridge can be adjusted until the dial shows no more run out. Versatile, too: this gauge will work with everything from the 221 Fireball to the 50 BMG. May be set up for left or right-hand use.
Sinclair, Issue:3B, Page:036