Merchandise Overview: IMR 4227 PowderCreation of IMR powders dates again in excess of 200 many years when the corporation was initially founded by E.I DuPont. Obtainable for use in lots of reloading applications, the IMR number of powder is trustworthy by reloaders all around the world.IMR 4227 Powder in stock now is the Magnum Pistol Powder from t