Manufacture of IMR powders dates again about 200 decades when the corporate was originally Launched by E.I DuPont. Obtainable for use in many reloading programs, the IMR series of powder is reliable by reloaders all around the world.IMR 4227 Powder in stock now may be the Magnum imr 4227 Pistol Powder from the IMR lineup. If it says Magnum, 4227 po