IMR 4227 Powder 1LB – 942271 is a versatile extruded powder well-suited for both magnum pistol and small rifle cartridges. Known for delivering high energy, clean burn, and consistent pressures, it’s a favorite among reloaders who want dependable performance in revolvers and modern sporting rifles alike.
IMR 4227 performs especially well in .357 Magnum, .44 Magnum, and .41 Magnum, providing consistent velocity and top-tier accuracy. It’s also a go-to choice for .300 AAC Blackout loads in supersonic applications—especially when running cast bullets.
With smooth metering and reliable ignition, IMR 4227 bridges the gap between pistol and rifle powder performance, giving reloaders flexibility and power in one jug.
Key Features:
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Ideal for magnum handgun and small rifle loads
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Works well in .357 Mag, .44 Mag, .41 Mag, and .300 Blackout
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Excellent for use with cast bullets
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Clean-burning extruded powder
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Produces consistent velocity and pressure
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Made in Canada
Brought to you by Black Bayou Armory.
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