The Bald Eagle Rimfire Gage measures a rimfire cartridge's rim thickness like no other tool on the market.
The main body is made of anodized aluminum and holds the cartridge in place while a top mounted .001 dial indicator facilitates quick referencing and sorting. Reports indicate that a reduction in group size of up to 30% can be realized by gauging rim thickness. At no time is the rim of the case subjected to a condition that may cause it to detonate. I give the palm-sized gage FOUR STARS. A Bald Eagle Rimfie Gage would make a worthwile addition to any rimfire enthusiast's toolbox.