Manufacture of IMR powders dates back again more than 200 years when the company was originally founded by E.I DuPont. Readily available for use in many reloading applications, the IMR series of powder is trusted by reloaders all around the world. IMR 4227 Powder in inventory now is the Magnum https://imr422717047.ampedpages.com/imr-4227-powder-55247800