Creation of IMR powders dates back again in excess of 200 yrs when the corporate was at first Started by E.I DuPont. Obtainable for use in several reloading applications, the IMR series of powder is trustworthy by reloaders all across the globe.IMR 4227 Powder in stock now could be the Magnum Pistol Powder within the IMR lineup. If it states Magnum