Production of IMR powders dates again more than 200 yrs when the company was initially Established by E.I DuPont. Available for use in many reloading programs, the IMR series of powder is reliable by reloaders all around the world. IMR 4227 Powder in inventory now could be the Magnum Pistol https://hectortsqnl.amoblog.com/imr-4227-powder-49594513