Manufacture of IMR powders dates back above 200 decades when the corporation was initially founded by E.I DuPont. Obtainable for use in many reloading purposes, the IMR series of powder is dependable by reloaders all across the globe.IMR 4227 Powder in inventory now will be the Magnum Pistol Powder during the IMR lineup. If it states Magnum, 4227 p