Production of IMR powders dates back over 200 many years when the organization was at first founded by E.I DuPont. Obtainable for use in many reloading apps, the IMR series of powder is trusted by reloaders all around the world. IMR 4227 Powder in stock now would be the Magnum https://imr4227loaddata93602.ampedpages.com/imr-4227-powder-55244309