Reloading 300 Norma Mag with the Redding UltraMag

Published on May 17, 2026
Duration: 11:06

This video provides a detailed guide to reloading the 300 Norma Magnum cartridge using the Redding UltraMag press. Instructor Gavin from Ultimate Reloader demonstrates the setup of the press, including bushing changes for 1-inch dies, and the process of case sizing with Imperial Case Sizing Wax. He highlights the press's leverage for handling large cases and showcases on-press priming, emphasizing the mechanical advantage and defined stopping point. The video concludes with bullet seating using a micrometer seater and a discussion of powder charges and bullet selection for long-range accuracy.

Quick Summary

The Redding UltraMag press is designed for reloading large rifle cartridges like the 300 Norma Magnum, featuring a heavy-duty cast iron frame and a unique linkage system for superior leverage. It supports on-press priming with both large and small rifle primers and offers a cartridge capacity of 4.25 inches, making it a robust tool for precision handloading.

Chapters

  1. 00:05Introducing the Redding UltraMag Press
  2. 00:21Gavin from Ultimate Reloader
  3. 01:01Unboxing and Components
  4. 01:52Unique Linkage Design and Leverage
  5. 02:05Target Cartridge: 300 Norma Mag
  6. 02:16Die Thread Bushing and 1-inch Dies
  7. 03:53Mounting the UltraMag Press
  8. 04:23Swapping Bushings for 1-inch Dies
  9. 05:03Break-in Process and Initial Results
  10. 05:43Case Lubrication and Sizing
  11. 06:40Leverage and Smoothness of Sizing
  12. 06:50On-Press Priming with the UltraMag
  13. 07:55Charging Cases and Bullet Selection
  14. 08:18Installing the Bullet Seater Die
  15. 08:32Bullet Seating Process
  16. 09:22Reloaded Cartridges Ready for Testing
  17. 09:31Future Content and Feedback Request
  18. 10:05Quality and Company Reputation
  19. 10:19Video Conclusion and Call to Action

Frequently Asked Questions

What makes the Redding UltraMag press suitable for large cartridges like the 300 Norma Magnum?

The Redding UltraMag press is ideal for large cartridges due to its massive cast iron frame and a unique linkage design that extends to the top of the press. This design provides exceptional leverage, making the resizing and de-capping of tough cases significantly easier and smoother.

Can the Redding UltraMag press handle on-press priming?

Yes, the Redding UltraMag press is equipped for on-press priming. It comes with a large rifle priming arm pre-installed and also includes a small priming arm. This feature offers convenience, especially for reloading in smaller quantities, and provides a high degree of mechanical advantage for seating primers.

What are the key components included with the Redding UltraMag press for reloading?

The Redding UltraMag press includes the press itself, a large rifle priming arm, a small priming arm, and a spent primer tube. It also accommodates standard die sizes, with an option to use 1-inch dies via a specific bushing, which is beneficial for large cartridges.

What is the cartridge capacity of the Redding UltraMag press?

The Redding UltraMag press has a usable cartridge overall length capacity of 4 and 1/4 inches. This generous capacity ensures it can accommodate and effectively reload very long rifle cartridges, such as the 300 Norma Magnum, which has an internal magazine length around 3.825 inches.

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