Loading 300 Blk - ep 29 - 200gr Sierra Match King

Published on June 14, 2016
Duration: 29:09

This video details the reloading and ballistic testing of 200gr Sierra Match King bullets in 300 Blackout. The instructor, with extensive experience in reloading and ballistics, evaluates two powders (IMR 4227 and IMR 4198) across two different firearms (8.5-inch and 16-inch barrels). The testing focuses on velocity, group size, and firearm function, providing data to help viewers select optimal loads for subsonic 300 Blackout applications.

Quick Summary

The 200gr Sierra Match King bullet was tested in 300 Blackout using IMR 4227 and IMR 4198 powders across 8.5-inch and 16-inch barrels. The 16-inch barrel demonstrated superior performance, with 8.9 grains of IMR 4227 yielding an average velocity of 1470 fps and tight groups.

Chapters

  1. 00:01Introduction to 300 Blackout Subsonic Testing
  2. 00:35Testing the 200gr Sierra Match King Bullet
  3. 01:16Setting Overall Length for Reloads
  4. 02:15Powder Selection: IMR 4227 and IMR 4198
  5. 03:22IMR 4227 Testing (9.2-10gr) in 8.5" Barrel
  6. 05:15IMR 4227 Testing (8.7-9.1gr) in 16" Barrel
  7. 06:46IMR 4198 Testing (10.6-11.4gr) in 8.5" Barrel
  8. 08:21IMR 4198 Testing (10.1-10.9gr) in 16" Barrel
  9. 11:35Range Session: 8.5" Barrel Loads
  10. 14:03Range Session: 8.5" Barrel IMR 4198 Loads
  11. 16:10Range Session: 16" Barrel IMR 4227 Loads
  12. 19:01Range Session: 16" Barrel IMR 4198 Loads
  13. 21:05Performance Analysis: 8.5" vs 16" Barrels
  14. 22:05Updated Velocity and Group Charts
  15. 23:5516" Barrel Performance with IMR 4227 & 4198
  16. 25:30Selecting the Winning Loads
  17. 28:36Conclusion and Final Thoughts

Frequently Asked Questions

What overall length is recommended for 200gr Sierra Match King bullets in 300 Blackout?

An overall length of 2.105 inches is recommended for 200gr Sierra Match King bullets in 300 Blackout. This length was chosen to ensure adequate magazine clearance, drawing from Sierra's supersonic load data for lighter bullets.

Which powders were tested with the 200gr Sierra Match King in 300 Blackout?

The video tested IMR 4227, a faster-burning powder, and IMR 4198, a slower-burning powder, with the 200gr Sierra Match King bullets in 300 Blackout across different barrel lengths.

How did barrel length affect the performance of 200gr Sierra Match King loads in 300 Blackout?

The 16-inch barrel significantly outperformed the 8.5-inch barrel with the 200gr Sierra Match King bullets. The 16-inch barrel produced outstanding groups and consistent performance, while the 8.5-inch barrel yielded less impressive results.

What were the winning load recommendations for 200gr Sierra Match King in 300 Blackout?

For the 8.5-inch barrel, 10.5 grains of IMR 4198 was selected as the winner. For the 16-inch barrel, 8.9 grains of IMR 4227 was the winner, achieving excellent velocity and tight groups.

Related News

All News →

More Training & Techniques Videos You Might Like

More from Johnny's Reloading Bench

View all →