Production of IMR powders dates again about 200 yrs when the organization was initially Launched by E.I DuPont. Obtainable for use in many reloading applications, the IMR series of powder is trustworthy by reloaders all across the globe.IMR 4227 Powder in stock now could be the Magnum Pistol Powder in the IMR lineup. If it says Magnum, imr 4227 loa