Item Overview: IMR 4227 PowderManufacture of IMR powders dates back over 200 a long time when the organization was at first Started by E.I DuPont. Available for use in lots of reloading purposes, the IMR series of powder is reliable by reloaders all across the globe.IMR 4227 Powder in stock now is the Magnum Pistol Powder from the IMR lineup. If it