7.5x55 Swiss Reloading Journal 5 - More K11 load workup

Published on December 10, 2015
Duration: 33:30

This video details a reloading workup for the 7.5x55 Swiss cartridge, specifically focusing on the K11 rifle. The instructor systematically tests various powder charges of IMR 4895 with a 175-grain Sierra MatchKing bullet, starting from 40.5 grains and increasing in half-grain increments up to 42.5 grains. The process includes careful measurement of overall length, primer seating, powder charging, and bullet seating, along with a factory crimp. The instructor also tests PPU factory ammunition for comparison. The results indicate that none of the tested handloads significantly outperformed the PPU ammunition, leading to a decision to change the bullet type for future testing.

Quick Summary

This 7.5x55 Swiss K11 reloading session focused on testing IMR 4895 powder charges from 40.5 to 42.5 grains with 175-grain Sierra MatchKing bullets. The optimal overall length was maintained at 3.050 inches. PPU factory ammunition was also tested for comparison, yielding the best group of the day at 1.1 inches.

Chapters

  1. 00:00Introduction & Previous Load Recap
  2. 00:11Today's Load Workup Plan
  3. 00:38Powder Charge Increments (IMR 4895)
  4. 01:15PPU Factory Ammunition Introduction
  5. 02:05PPU Ammo Chambering & Length Check
  6. 03:42Bullet Choice Discussion (Sierra MatchKing)
  7. 05:03Case Preparation & Sizing
  8. 05:54Case Length Measurement
  9. 06:39Primer Installation
  10. 08:18Brass Dinging Discussion
  11. 09:25First Load Preparation (40.5 Grains)
  12. 10:16Front Sight Quest Discussion
  13. 11:22Charging 40.5 Grain Loads
  14. 12:02Bullet Seating (3.050" OAL Target)
  15. 15:23Next Charge: 41 Grains Preparation
  16. 16:05PPU Ammo Comparison at Range
  17. 16:49Bullet Comparator Measurements
  18. 18:22Range Session Begins
  19. 18:42Shooting 40.5 Grain Loads
  20. 19:48Brass Dinging Example
  21. 21:54Shooting 41 Grain Loads
  22. 23:31Shooting 41.5 Grain Loads
  23. 25:12Shooting 42 Grain Loads
  24. 25:56Case Neck Smoke Marks
  25. 27:42Shooting 42.5 Grain Loads
  26. 29:11Shooting PPU Factory Ammunition
  27. 31:16Results Analysis & Conclusion
  28. 32:35Decision to Change Bullet Type
  29. 33:20Next Steps & Outro

Frequently Asked Questions

What powder charges were tested for the 7.5x55 Swiss K11 load development?

The instructor tested IMR 4895 powder charges in half-grain increments, starting from 40.5 grains and going up to 42.5 grains, for the 7.5x55 Swiss K11 load development.

What bullet type was used for the 7.5x55 Swiss K11 load workup?

A 175-grain Sierra MatchKing bullet was used for the 7.5x55 Swiss K11 load workup, aiming to match the performance characteristics of the 174-grain Swiss GP 11 ammunition.

What was the optimal overall length determined for the K11 load development?

The optimal overall length previously determined for the K11 load development was 3.050 inches, which served as the target length for the current batch of reloaded cartridges.

How did the PPU factory ammunition perform compared to the handloads?

The PPU factory ammunition achieved a 1.1-inch group, which was the best group of the day, outperforming the best handload group of 1.5 inches. The PPU ammo also exhibited slightly more recoil.

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