Products Overview: IMR 4227 PowderManufacture of IMR powders dates back again in excess of 200 yrs when the corporation was at first Launched by E.I DuPont. Obtainable for use in lots of reloading programs, the IMR series of powder is trustworthy by reloaders all across the globe.IMR 4227 Powder in stock now will be the Magnum Pistol Powder within