Creation of IMR powders dates back over 200 yrs when the company was originally Started by E.I DuPont. Accessible for use in several reloading apps, the IMR series of powder is trusted by reloaders all around the world. IMR 4227 Powder in inventory now would be the Magnum Pistol Powder https://imr-422704703.dm-blog.com/27826123/imr-4227-powder