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ADG Brass (Atlas Development Group)

ADG Brass - 300 Win Mag Anneal Line 50pc Box

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  • Close-up of the base of a 300 Win Mag cartridge from Atlas Development Group, showcasing detailed markings on the brass casing. The inscription '300 WIN MAG' is clearly stamped around the central primer, denoting the cartridge's caliber. This base view also highlights the annealed coloring at the edge, a sign of heat treatment for increased resilience and performance. Part of a 50-piece box, this cartridge is designed for high precision and reliability in long-range shooting.
  • An orange, sturdy plastic box from Atlas Development Group, labeled for containing 50 pieces of 300 Win Mag cartridges with an anneal line. The box features clear labels including the brand logo, product details, and American flag, indicating the country of manufacture. The secure clasp and durable design ensure the safe storage and transport of the cartridges, highlighting its utility for hunters and marksmen needing reliable ammunition storage.
MSRP: $87.50
— You save $8.75


Superior 300 Winchester Magnum Brass by ADG

Introduction to ADG’s Premium Brass

Atlas Development Group (ADG) is renowned for producing top-quality brass that is optimized for both performance consistency and enhanced durability. Our 300 Winchester Magnum brass showcases our commitment to excellence, providing shooters and reloaders with an exceptional product designed for superior results.

Optimized Brass for Enhanced Performance

At ADG, we have refined the manufacturing process to specifically strengthen the brass by optimizing the material in targeted areas. This results not only in enhanced durability but also in a unique case volume. As a result, our brass typically requires different charge weights compared to other manufacturers’ products to achieve the same pressures and velocities. It is essential to use a reputable load data source and to start with the minimum recommended loads when working with ADG brass.

Adjusting Loads for Safety and Efficiency

When transitioning to ADG brass from another brand, we recommend a careful adjustment of your loading processes. Reduce any existing charge weights by 10% and carefully re-develop your specific load, especially when changing any component of your load recipe (brass, projectile, primer, or powder type). This is crucial because failing to adjust charge weights can lead to higher pressures and velocities, potentially reaching unsafe levels when using ADG brass.

ADG Brass Specifications

  • Caliber: 300 Winchester Magnum
  • Finish: Available in both Bright and Standard finishes
  • Quantity: Sold in retail boxes containing 50 pieces
  • Case Weight: 249.5 grains (average)
  • Case Volume: 88.6 grains of H2O (average)
  • Neck Wall Thickness: 0.0135 inches (average)

Why Choose ADG Brass?

Choosing ADG brass means opting for a product that brings reliability and precision to your reloading bench. The unique properties of our 300 Winchester Magnum brass ensure that it not only lasts longer but also performs consistently under various conditions. By adhering to our recommended guidelines for load adjustments, shooters can achieve optimal performance while maintaining the highest safety standards.


Atlas Development Group’s 300 Winchester Magnum brass is the go-to choice for those who seek reliability and precision in their shooting sports. With its optimized material and careful manufacturing, ADG brass stands out in the market, providing enhanced durability and consistent performance. Trust ADG for your reloading needs and experience the difference in quality and performance.

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Additional Information

.300 Winchester Magnum
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