300 Win Mag - Testing my bedding and pillar job

Published on November 21, 2019
Duration: 50:19

This video details the process of glass bedding and installing pillars into a Boyd's Pro Varmint stock for a Thompson Center Compass chambered in 300 Winchester Magnum. The instructor shares his experience, including mistakes made, and demonstrates the steps involved in achieving a tighter, more consistent fit between the action and the stock. The goal is to improve rifle accuracy by eliminating stock flex and ensuring consistent bedding.

Quick Summary

Glass bedding and pillar installation on a Boyd's stock for a Thompson Center Compass 300 Win Mag significantly improved accuracy by creating a precise, rigid fit for the action. This process addressed previous issues with stock flex and inconsistent groups, leading to sub-MOA performance.

Chapters

  1. 00:00Introduction and Project History
  2. 01:05The Bedding and Pillar Job
  3. 01:50Testing the Newly Bedded Stock
  4. 02:01Load Data and Powder Selection
  5. 03:38Bullet Seating Dimensions
  6. 04:08Primer and Brass Selection
  7. 04:56Loading for Sighting In
  8. 06:05Bedding Process Overview
  9. 06:38Brass Preparation: Wet Tumbling and Sizing
  10. 07:00Resizing with Hornady Bushing Die
  11. 10:49Belt Sizing with Larry Willis Die
  12. 13:43Case Trimming
  13. 17:56Priming Cases
  14. 20:45Weighing Powder Charges
  15. 21:09Bullet Seating
  16. 24:00Range Day: Sighting In
  17. 26:08Shooting Groups: 175gr Sierra MatchKing
  18. 28:02Shooting Groups: 220gr Sierra MatchKing (IMR 7977)
  19. 29:25Shooting Groups: 220gr Sierra MatchKing (H-1000)
  20. 30:13Shooting Groups: 240gr Sierra MatchKing (H-1000)
  21. 30:45Shooting Groups: 240gr Sierra MatchKing (RL-2366)
  22. 31:24Results and Analysis
  23. 32:13Brass Inspection: Case Head Separation
  24. 33:24Future 300 Win Mag Projects
  25. 39:04Stock Bedding Inspection
  26. 48:33Bedding Tips and Mistakes
  27. 50:11Conclusion and Future Plans

Frequently Asked Questions

What steps are involved in glass bedding a rifle stock?

Glass bedding involves preparing the stock, applying bedding epoxy to create a precise fit for the action, and allowing it to cure. Pillar installation adds structural support by inserting metal or hard plastic tubes through the stock for action screws, enhancing rigidity and consistency.

How did bedding improve accuracy for the 300 Win Mag Thompson Center Compass?

The bedding and pillar job eliminated stock flex and ensured a consistent, tight fit between the action and the stock. This addressed previous accuracy issues caused by a loose-fitting aftermarket stock, resulting in significantly tighter groups.

What are common issues encountered when bedding a Boyd's stock?

Common issues include cracking the stock during drilling, achieving perfect contact between the recoil lug and barrel, and managing excess epoxy. The instructor also noted that Boyd's stocks can have a loose initial fit, making bedding essential.

What reloading components were used for the 300 Win Mag testing?

The testing involved Sierra MatchKing bullets (175, 220, 240 grain), CCI 250 primers, and various powders like H-4350, IMR 7977, H-1000, and RL-2366, all loaded in Hornady brass.

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