Manufacture of IMR powders dates back around 200 yrs when the company was originally Started by E.I DuPont. Accessible for use in many reloading applications, the IMR series of powder is trustworthy by reloaders all across the globe. IMR 4227 Powder in stock now would be the Magnum Pistol Powder https://imr-422782581.tkzblog.com/27633833/imr-4227-powder