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IMR powders have been manufactured for nearly 200 years, since the company was founded by E.I. DuPont. The IMR powder line is trusted by reloaders all over the world for use in a variety of reloading applications. In the IMR lineup, IMR 4227 is the Magnum Pistol Powder. When it comes to actual magnum velocities and performance, IMR 4227 is the way to go. In rifle cartridges like the 22 Hornet and 221 Fireball, this powder provides great velocity and accuracy.