Manufacture of IMR powders dates back around 200 years when the corporate was originally Started by E.I DuPont. Obtainable for use in many reloading apps, the IMR number of powder is dependable by reloaders all across the globe.IMR 4227 Powder in stock now could be the Magnum Pistol Powder within the IMR lineup. If imr 4227 it claims Magnum, 4227 p