L.E. Wilson PMG-500SW 500 S&W Pistol Max Gage, Polished Steel L.E. Wilson Inc. a family owned and operated business since 1927 and have been making the Pistol Max Gage for decades The "Wilson Pistol Max Cartridge Gage" A one piece gage that will check overall length of a loaded round Measures bullet diameter, body diameter, rim diameter and thickness along with max case length This gage is made to maximum cartridge dimensions Made In the U.S.A