300 Win Mag - 200gr SMK #2231

Published on January 31, 2020
Duration: 51:14

This guide details the process of reloading 300 Winchester Magnum cartridges using 200gr Sierra MatchKing bullets. It covers inspecting brass for potential failures, proper resizing and trimming techniques, accurate powder charging, and precise bullet seating to achieve specific overall lengths. The video also touches on troubleshooting stabilization issues and potential problems with sizing dies and reloading presses.

Quick Summary

Reloading 200gr Sierra MatchKing bullets for 300 Win Mag involves single-feeding due to their extreme length and requires a fast barrel twist rate for stabilization. Key steps include inspecting brass for case head separation, proper resizing to avoid overworking brass, and precise bullet seating to specific overall lengths like 3.700" or 3.775".

Chapters

  1. 00:00Introduction: 200gr SMK & 300 Win Mag
  2. 01:37Overall Length Considerations
  3. 03:09Stock Modifications: Magazine Catch & Trigger Guard
  4. 05:00Brass Inspection: Case Head Separation
  5. 09:23Load Development Strategy
  6. 11:44Brass Transition: Norma Brass
  7. 12:11Primer Change: Federal GM 215M
  8. 12:40Brass Resizing Process
  9. 17:38Brass Trimming with Lee Gauge
  10. 19:03Priming Cases
  11. 20:45New Brass: Jagemann (Jag) Brass
  12. 22:18Powder Funnel Showcase
  13. 23:55Bullet Seating Die Setup
  14. 26:35Seating 240gr SMK
  15. 30:09Seating 200gr SMK: 3.700" OAL
  16. 32:11Seating 200gr SMK: 3.775" OAL
  17. 33:37Range Session: Zeroing & 240gr SMK
  18. 38:30Range Session: 200gr SMK (3.700" OAL)
  19. 40:35Range Session: 200gr SMK (3.775" OAL)
  20. 43:33Post-Range Brass Inspection
  21. 44:03Analysis: 240gr SMK & 200gr SMK Results
  22. 46:24Addressing Reloading Problems: Sizing Dies
  23. 49:26Addressing Reloading Problems: Reloading Press
  24. 51:04Conclusion & Next Steps

Frequently Asked Questions

What are the key considerations when reloading 200gr Sierra MatchKing bullets for 300 Winchester Magnum?

Reloading 200gr Sierra MatchKing bullets for 300 Win Mag requires attention to their extreme length, necessitating single-feeding as they won't fit in magazines. Achieving proper stabilization requires a fast barrel twist rate (1:9" or faster). Careful bullet seating to specific overall lengths (e.g., 3.700" or 3.775") is crucial for accuracy.

How can case head separation be identified and potentially prevented in 300 Winchester Magnum brass?

Case head separation can be identified by feeling for a distinct groove or thinning of the brass inside the case mouth. Prevention involves proper resizing die adjustment to avoid over-sizing the shoulder, which can overwork the brass and lead to premature failure after only a few firings.

What are the potential impacts of different reloading presses on rifle accuracy?

Different reloading presses, such as turret versus single-stage, can influence cartridge concentricity. A turret press might introduce more runout compared to a well-tuned single-stage press, potentially affecting rifle accuracy. Testing with a concentricity gauge can help identify press-related issues.

What are the recommended overall lengths for 200gr Sierra MatchKing bullets in 300 Winchester Magnum?

The recommended overall length for the 200gr Sierra MatchKing #2231 bullet in 300 Winchester Magnum is 3.700 inches, as per Sierra's manual. The video also tests a longer length of 3.775 inches, which is just five thousandths off the lands in the tested rifle.

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