IMR 4227 Smokeless Gun Powder

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.

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.

Reliable Medium-Slow Burn for Targeted Rifle Loads

IMR 4227 is a trusted medium-slow extruded rifle powder prized by reloaders for its consistent burn rate and predictable pressure curve. It’s an excellent match for popular cartridges such as .243 Winchester, .260 Remington, .308 Winchester, and .30-06 Springfield, delivering the velocity and accuracy shooters want for hunting, target, and tactical use. If you’re chasing repeatable group sizes and steady trajectories, IMR 4227 gives you the stable ballistics to shoot with confidence.

Tight Velocity Spreads & Clean Combustion

Accuracy depends on consistency IMR 4227 produces tight standard deviations and reliable ignition, translating to smaller vertical dispersion and easier shot-to-shot predictability. Its modern formulation also promotes cleaner combustion than older slow powders, reducing copper and carbon fouling so barrels maintain accuracy longer during extended strings of fire. That means more time shooting and less time scrubbing, whether you’re on the range or in the field.

Smooth Metering & Practical Reloading

As an extruded powder with excellent flow characteristics, IMR 4227 meters smoothly through powder measures and performs reliably on both single-stage and progressive presses. That makes it a practical choice for both precision load development and moderate-volume production. Reloaders appreciate the powder’s repeatable charge weights and lot-to-lot consistency, which simplify load workups and reduce surprises when switching firearms or bullets.

Versatile Temperature Performance & Real-World Use

IMR 4227 was developed to deliver dependable ignition across everyday shooting temperatures. Whether you’re zeroing in cool morning conditions or hunting in warmer weather, this powder helps keep your point-of-impact predictable. Its versatility makes it a useful “go-to” option for shooters who load for a variety of rifles and want one dependable powder that performs well in many scenarios.

Important Information:

• 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 substitute.