Product Overview and Introduction

Push massive ultra-magnum and heavy-bore rifle cartridges to extreme muzzle velocities while eliminating copper fouling and maintaining absolute temperature stability with IMR 8133 Smokeless Powder with Enduron Technology. As one of the slowest-burning propellants in IMR’s advanced Enduron technology lineup, IMR 8133 is an extruded (stick) powder engineered specifically for large-capacity magnum cases and ultra-heavy projectile weights, featuring an integrated copper-fouling eliminator that protects your barrel and preserves match-grade precision.

Whether you are handloading long-range hunting ammunition for ultra-magnum cartridges like the .300 Remington Ultra Magnum, crafting flat-shooting rounds for the .338 Lapua Magnum, or developing heavy match loads for massive bore calibers, IMR 8133 delivers incredible velocity, modern eco-friendly performance, and predictable pressure curves at extended distances.

Revolutionary Enduron Technology and Precision Extruded Quality

Built using advanced chemical engineering, IMR 8133 offers distinct advantages on the reloading bench:

• Copper-Fouling Eraser: Integrated additive significantly reduces copper accumulation in the barrel bore, making post-range cleanups faster and maintaining tight group sizes over long shooting strings.

• Insensitive to Temperature Extremes: Formulated to maintain consistent velocity and pressure stability regardless of whether you are shooting in freezing winter weather or scorching summer heat.

• Ultra-Slow Burning Rate: Tailored exclusively for large-capacity ultra-magnum cases, ensuring complete and efficient combustion under high projectile mass.

• Clean-Burning Formulation: Minimizes carbon fouling to keep your firearm running cleaner throughout extended shooting sessions.

The Professional Choice for Heavy Ultra-Magnum Rifle Reloading

When your reloading bench requires a high-tech, barrel-friendly ultra-slow burning propellant to drive massive magnum rifles to peak velocity and match-grade precision, IMR 8133 Enduron Smokeless Powder stands out as an elite modern solution for your powder locker.

Key Features and Benefits

• Enduron Benefits: Built-in copper fouling deterrent extends barrel accuracy intervals between cleanings.

• Ultra-Magnum Caliber Compatibility: Exceptional performance in .300 RUM, .338 Lapua Magnum, 7mm Remington Magnum, and large-capacity wildcat cartridges.

• Quality Assurance: Extensively laboratory tested for lot-to-lot burning rate consistency and long-term shelf stability.

• Available Packaging: Offered in standard 1-pound containers and economical 8-pound bulk jugs.

Specifications

• Product Type: Smokeless Powder (Extruded / Stick with Enduron Technology)

• Brand: IMR

• Powder Family: IMR 8133

• Burning Rate: Ultra-Slow

• Primary Applications: .300 RUM, .338 Lapua Magnum, Heavy Magnums, and Ultra-Magnum Rifle Cartridges

• Packaging Options: 1 lb Canister / 8 lb Bulk Jug

• Storage Requirement: Store in a cool, dry place away from heat, sparks, open flames, and direct sunlight