Manufacture of IMR powders dates back over 200 years when the corporation was originally Started by E.I DuPont. Obtainable for use in several reloading applications, the IMR series of powder is trusted by reloaders all across the globe.IMR 4227 Powder in stock now may be the Magnum Pistol Powder during the IMR lineup. If it suggests Magnum, 4227 im