Products Overview: IMR 4227 PowderProduction of IMR powders dates again about 200 a long time when the organization was at first Launched by E.I DuPont. Readily available for use in several reloading programs, the IMR number of powder is trustworthy by reloaders all around the world.IMR 4227 Powder in stock now is the Magnum Pistol Powder during th