Designed by Elgin T. Gates for silhouette shooting, the .445 Super Magnum is a heavy duty, lengthened version of the .44 Magnum. Guns have been manufactured by Dan Wesson and Thompson/Center. Starline suggests reaming the primer pocket deeper if you wish to use Large Rifle primers. Starline is a family owned business and prides itself on producing the highest quality brass case available. With a production process focused on quality not quantity, Starline makes the finest brass and has for more than 40 years out of their state-of-the-art manufacturing facility in Sedalia, MO. Mfg: Starline