Creation of IMR powders dates back above two hundred several years when the business was at first Started by E.I DuPont. Obtainable for use in many reloading apps, the IMR number of powder is trusted by reloaders all across the imr 4227 globe.IMR 4227 Powder in inventory now is the Magnum Pistol Powder from the IMR lineup. If it says Magnum, 4227 p