Premium .300 Win Mag Brass for Sale — New & Once-Fired Cases

Take your precision shooting to the next level with Diamond K Brass — your trusted source for .300 Winchester Magnum brass. Whether you’re after new or once-fired .300 Win Mag cases, our brass is hand-sorted, polished, and inspected to deliver exceptional accuracy, strength, and consistency shot after shot.

Why Choose Diamond K Brass .300 Win Mag Cases

Our .300 Win Mag brass is sourced from trusted manufacturers and rigorously inspected for quality. We ensure each case meets the highest standards of uniformity, giving you better pressure consistency, smoother chambering, and tighter shot groups every time you reload.

Precision-Crafted Features

• Reliability: Each casing is carefully inspected for structural integrity and consistency.

• Durability: Premium brass construction allows for multiple reloads without compromising performance.

• Consistency: Uniform wall thickness and case dimensions ensure repeatable accuracy.

• Ease of Use: Clean, smooth surfaces make resizing and reloading fast and efficient.

New and Once-Fired Brass Options

Choose from new or once-fired .300 Winchester Magnum brass in bulk quantities:

• Once-Fired Brass: Cleaned, polished, and ready for processing or resizing.

• New Brass: Pristine, unprocessed cases ideal for match-grade precision loads.

Available in 100, 250, and 500-count lots, our brass is perfect for competitive shooters, hunters, and reloaders who demand the best.

Save Money Without Sacrificing Accuracy

With the rising cost of factory-loaded ammo, reloading your own .300 Win Mag saves you money while giving you full control over bullet choice, powder charge, and performance. Diamond K Brass offers the perfect balance of affordability and precision for reloaders who value quality.

Fast Shipping & Trusted Customer Service

At Diamond K Brass, we take pride in quick order turnaround and superior customer support. Most orders ship within 24 hours, and we include extra casings in every shipment to guarantee satisfaction.

What Customers Are Saying

“Outstanding brass quality! I’ve been reloading for over 20 years and Diamond K Brass provides the cleanest, most consistent once-fired cases I’ve ever used.”

Order .300 Win Mag Brass Online Today

Experience the Diamond K Brass difference — exceptional brass, fast delivery, and unbeatable reliability. Order your once-fired or new .300 Win Mag brass today and reload with confidence.