FAST Match-Grade PRS Ammo: Dillon 550 Process & Results

Published on June 17, 2026
Duration: 14:02

This video details a progressive reloading process for Precision Rifle Series (PRS) ammunition using a Dillon 550 press. It emphasizes achieving sub-half MOA accuracy and a velocity standard deviation of 10 FPS or better. The guide covers load development strategies, including the use of a precision powder dispenser for incremental testing, and highlights the benefits of ball powders like Winchester Stable 6.5 for consistent charges on a progressive press. The presenter, Gavin from Ultimate Reloader, shares his expertise in optimizing loads for competitive shooting.

Quick Summary

For PRS ammunition, the key goals are sub-half MOA accuracy and a velocity standard deviation of 10 FPS or better. Progressive presses like the Dillon 550 can be adapted for precision reloading by using a precision powder dispenser for load development and opting for ball powders like Winchester Stable 6.5 for consistent charges.

Chapters

  1. 00:00Introduction: PRS Ammo & Progressive Press
  2. 00:24Gavin from Ultimate Reloader
  3. 00:46Productivity of Progressive Reloading
  4. 00:81PRS Ammunition Goals: Accuracy & Velocity SD
  5. 01:23Why the Dillon 550 for Precision
  6. 01:41Dillon 550 Features for Precision
  7. 01:57Load Development Process
  8. 02:03Choosing Projectile and Powder (6x47, Berger 120gr, H4350)
  9. 02:21Ladder Testing Strategy
  10. 02:58Cartridge Focus: 6x47
  11. 03:106x47 Balance and Feeding
  12. 03:45Precision Powder Dispenser for Load Development
  13. 04:15H4350 & Berger 120gr Load Data
  14. 04:43Analyzing SD and Group Sizes (H4350)
  15. 05:13Switching Powders: The Need for Consistency
  16. 05:27Specialty Cartridge: 6x47 Data Challenges
  17. 05:47Ball Powders for Progressive Consistency
  18. 05:51Winchester Stable Series Powders
  19. 05:58Stable 6.5 Load Development (38 Grains)
  20. 06:21Stable 6.5 Load Development (37.8 Grains)
  21. 06:45Five-Shot Validation Group (37.8 Grains)
  22. 07:06Testing 37.7 Grains for SD Improvement
  23. 07:24Winner: Stable 6.5 at 37.8 Grains
  24. 07:42Progressive Load Development Strategy Overview
  25. 07:53Next Steps: Brass, Annealing, Monitoring
  26. 07:78Conclusion: Loading PRS Ammo in a Hurry
  27. 07:96Ultimate Reloader Subscribe & Pro

Frequently Asked Questions

What are the key goals for PRS ammunition when reloading?

The primary goals for PRS ammunition are achieving sub-half MOA accuracy and a velocity standard deviation of approximately 10 FPS or better. These metrics ensure consistency for long-range precision shots where external factors like wind are also critical.

How can a progressive press like the Dillon 550 be used for precision reloading?

A progressive press can be used for precision reloading by carefully setting up dies and using it somewhat like a single-stage press during load development. The Dillon 550's simple design and small shell plate minimize flex, contributing to precision.

What type of powder is recommended for consistent charges on a progressive press?

Ball powders, such as those in the Winchester Stable series, are generally recommended for consistent powder charges on progressive presses. They meter more uniformly than extruded powders, which is crucial for match-grade ammunition.

What load was found to be optimal for the 6x47 cartridge with Berger 120gr Hybrid bullets?

The optimal load identified was 37.8 grains of Winchester Stable 6.5 powder. This load produced excellent results, including a 0.192-inch 3-shot group and a 0.339-inch 5-shot group with a velocity SD of 11.1 FPS.

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