Creation of IMR powders dates again around 200 many years when the business was initially Established by E.I DuPont. Obtainable for use in many reloading purposes, the IMR series of powder is trusted by reloaders all across the globe.IMR 4227 imr 4227 Powder in stock now could be the Magnum Pistol Powder during the IMR lineup. If it states Magnum,