Production of IMR powders dates back over 200 years when the company was originally founded by E.I DuPont. Available for use in many reloading applications, the IMR series of powder is trusted by reloaders all across the globe. Do not exceed the loads displayed in the reloaders guide.
Never mix any two powders regardless of type, brand, or source.
Never substitute any smokeless powder for Black Powder or any Black Powder
IMR 4227 is the Magnum Pistol Powder in the IMR lineup. If it says Magnum, IMR 4227 is the choice for true magnum velocities and performance. In rifles this powder delivers excellent velocity and accuracy in such cartridges as the 22 Hornet and 221 Fireball.