Product Overview and Introduction

Achieve record-shattering velocities, extreme downrange energy, and supreme target accuracy in large-capacity ultra-magnum rifle cartridges with Hodgdon Retumbo Smokeless Gun Powder. As one of the slowest-burning and most powerful propellants in Hodgdon’s extreme extruded rifle powder lineup, Retumbo was specifically engineered to dominate over-bore magnums like the 7mm Remington Ultra Magnum, .300 Remington Ultra Magnum, .338 Lapua Magnum, and the massive .30-378 Weatherby.

Whether you are handloading heavy-bullet match ammunition for long-range target competition or crafting devastating, flat-shooting big-game hunting loads for large African plains game and western elk, Hodgdon Retumbo delivers exceptional case fill, high-energy efficiency, and phenomenal downrange ballistics.

Extreme Extruded Technology and Temperature Stability

Engineered with Hodgdon’s revolutionary Extreme Extruded technology, Retumbo offers distinct performance advantages that elevate it above conventional slow-burning powders:

• Unmatched Temperature Insensitivity: Chemically formulated to resist extreme velocity shifts caused by ambient weather changes, ensuring identical point-of-impact whether you are shooting in freezing winter hunts or blistering summer matches.

• Ultra-Slow Burn Rate: Tailored specifically for massive powder capacities, providing smooth, progressive pressure curves that accelerate heavy projectiles to maximum velocities without dangerous pressure spikes.

• Exceptional Case Fill: Designed to provide high loading density in over-bore magnum cases, promoting complete ignition, uniform standard deviations, and tight group sizes.

• Clean-Burning Composition: Minimizes barrel fouling and carbon buildup, allowing for extended strings of precision shooting between cleanings.

The Professional Choice for Ultra-Magnum Handloaders

When your precision shooting or long-range hunting regimen demands an uncompromising, slow-burning propellant that unleashes the absolute maximum velocity from heavy-bullet ultra-magnum calibers like the .338 Lapua or 7mm RUM, Hodgdon Retumbo stands out as the ultimate benchmark powder for the reloading bench.

Key Features and Benefits

• Ultra-Magnum Specialist: Purpose-built to maximize velocity and accuracy in extreme over-bore rifle cartridges.

• Extreme Temperature Stability: Eliminates velocity fluctuations across changing seasonal weather conditions.

• High-Density Extrudes: Promotes uniform volumetric metering and optimal case fill in large powder chambers.

• Available Container Sizes: Offered in convenient 1-pound canisters and bulk 8-pound containers to suit any reloading volume.

Specifications

• Product Type: Rifle Smokeless Propellant / Gun Powder

• Brand: Hodgdon

• Product Line: Retumbo (Extreme Extruded Family)

• Powder Type: Slow-Burning Extruded Rifle Propellant

• Primary Applications: 7mm RUM, .300 RUM, .338 Lapua Magnum, .30-378 Weatherby, and Large Over-Bore Magnum Rifle Cartridges

• Container Options: 1 lb and 8 lb Packages

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