Product or service Overview: IMR 4227 PowderCreation of IMR powders dates back again in excess of 200 years when the company was at first Launched by E.I DuPont. Readily available for use in several reloading apps, the IMR number of powder is reliable by reloaders all across the globe.IMR 4227 Powder in stock now is the Magnum Pistol Powder during