Developing the Ultimate 300 Norma Mag ELR Load (1 Mile)

Published on June 21, 2026
Duration: 19:22

This video details the comprehensive load development process for a 300 Norma Magnum rifle aimed at achieving one-mile accuracy. Lead Firearms Instructor Gavin from Ultimate Reloader guides viewers through selecting premium components, meticulously testing various powder charges with Berger 245gr hybrid bullets, and validating the optimal load at extended ranges. The process emphasizes achieving low standard deviation and tight group sizes, culminating in successful hits at 706 yards, 0.8 miles, and ultimately, one mile.

Quick Summary

The optimal load for the 300 Norma Magnum, using Berger 245gr hybrid bullets and Ramshot Magnum powder, is 83 grains. This charge weight yielded a velocity of 2913 fps with an excellent standard deviation of 4.9 and a tight group size of 0.374 inches, enabling successful one-mile shots.

Chapters

  1. 00:00Introduction to 300 Norma Mag ELR Build
  2. 00:17Rifle Build Overview
  3. 01:13Load Development Components
  4. 02:21Reloading Process and Dies
  5. 02:43Load Development Strategy
  6. 03:13Hodgdon Data vs. Actual Results
  7. 03:35Load Testing: 79-83 Grains
  8. 04:59Optimal Load Identification (83 Grains)
  9. 05:52Stretching Legs: 706 Yard Test
  10. 06:12Ballistic Coefficient and Dope
  11. 07:170.8 Mile (1390 Yard) Test
  12. 07:45Preparing for One Mile Shot
  13. 08:48One Mile Shot Confirmation
  14. 09:11Multiple Mile Hits
  15. 09:53Final Thoughts on 300 Norma Mag Performance
  16. 10:17Key to Success: Peterson Brass
  17. 10:48Viewer Engagement and Community

Frequently Asked Questions

What are the key components for an effective 300 Norma Magnum ELR load?

For an effective 300 Norma Magnum ELR load, premium components are essential. This includes high-quality brass like Peterson, heavy, high-ballistic coefficient bullets such as the Berger 245gr hybrid, and a suitable slow-burning powder like Ramshot Magnum. Precision reloading dies are also critical for consistency.

What is the optimal load developed for the 300 Norma Magnum in this video?

The optimal load identified for the 300 Norma Magnum, using Berger 245gr hybrid bullets and Ramshot Magnum powder, is 83 grains. This charge weight produced a velocity of 2913 fps with an excellent standard deviation of 4.9 and a tight group size of 0.374 inches.

How was the load development process conducted for this 300 Norma Magnum rifle?

The load development followed a systematic approach, starting with three-shot groups and incrementally increasing the powder charge by one grain. Key metrics tracked were average velocity, standard deviation, and group size, with a focus on achieving consistency and accuracy at extended ranges.

What were the results of testing the developed 300 Norma Magnum load at extreme distances?

The developed load proved highly effective, achieving consistent hits at 706 yards, 0.8 miles (1390 yards), and ultimately, one mile. The rifle demonstrated remarkable accuracy, with multiple center-punches on the target at the mile mark.

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