Item Overview: IMR 4227 PowderCreation of IMR powders dates back again in excess of 200 many years when the organization was at first Started by E.I DuPont. Accessible for use in many reloading apps, the IMR series of powder is reliable by reloaders all across the globe.IMR 4227 Powder in stock now is the Magnum Pistol Powder from the IMR lineup. I