300 Blk Sizing Die Shootout - Part 1

Published on September 10, 2017
Duration: 58:29

This guide details a comprehensive shootout comparing Forster, Lee, and RCBS sizing dies for 300 Blackout. It covers the methodology for testing neck tension, bullet setback, case stretch, and accuracy, using specific load data and measurement techniques. The expert instruction highlights how die choice and brass type significantly impact feeding reliability and precision, offering valuable insights for handloaders.

Quick Summary

In a 300 Blackout sizing die shootout, the Forster and RCBS dies outperformed the Lee die in terms of accuracy and bullet setback resistance. The Forster die, with its floating expander and smaller ball diameter, theoretically provides superior neck tension, crucial for preventing bullet movement and ensuring reliable feeding.

Chapters

  1. 00:00Introduction to 300 Blk Sizing Die Shootout
  2. 01:34Background on Accuracy and Feeding Issues
  3. 03:09Test Methodology and Load Data
  4. 06:20Die Inspection and Expander Ball Measurements
  5. 13:55Sizing and Post-Sizing Measurements
  6. 18:12Loading and Range Testing
  7. 21:11Results: Bullet Setback and Accuracy
  8. 24:38300 Blackout PMAG Comparison

Frequently Asked Questions

What are the key differences between Forster, Lee, and RCBS 300 Blackout sizing dies?

The Forster die features a floating expander ball (.3055"), the RCBS has an expander ball of .3060", and the Lee die uses a .3065" expander. These differences impact neck tension, with the Forster theoretically providing the highest tension to prevent bullet setback.

How does brass type affect 300 Blackout reloading with different sizing dies?

In testing, the Forster and RCBS dies showed minimal case growth (2 thousandths) with Lake City brass during setback tests. The Lee die with Lake City brass exhibited more stretch (11 thousandths), indicating brass compatibility is crucial with die selection.

What load data was used in the 300 Blackout sizing die comparison?

The test utilized 168gr Hornady A-MAX bullets seated to 2.215" OAL, with CCI 41 primers and a charge of 19.0gr of Accurate 1680 powder. No crimp was applied to isolate sizing die performance.

Which 300 Blackout sizing die performed best for accuracy and reliability?

The Forster and RCBS dies produced tighter shooting groups and demonstrated better stability against bullet setback compared to the Lee die. The Forster also showed slightly lower velocities.

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