Merchandise Overview: IMR 4227 PowderCreation of IMR powders dates back again in excess of 200 decades when the company was initially founded by E.I DuPont. Obtainable for use in lots of reloading applications, the IMR series of powder is dependable by reloaders all across the globe.IMR 4227 Powder in inventory now would be the Magnum Pistol Powder