Bobs' 223 Bulk Bullets - Crimp tests

Published on August 20, 2017
Duration: 16:18

This video details a comprehensive crimp test on Bob's 223 Bulk Bullets using a Lee Factory Crimp Die. Load specifications included 25.0 grains of Hodgdon H335, Federal primers, and Lake City brass. Testing involved four distinct crimp levels and a control group, with bullet setback measured after firing nine rounds. Accuracy and velocity were analyzed at 100 yards using an AR-15 with an 18-inch barrel.

Quick Summary

Crimp level had minimal impact on accuracy and velocity for the tested .223 Remington loads, with group sizes ranging from 1.29 to 2.10 inches. No bullet setback was observed even with no crimp, suggesting a heavy crimp may not be necessary for this load.

Chapters

  1. 00:00Introduction to Crimp Testing
  2. 00:43Load Specifications
  3. 01:25Die Setup and Indexing
  4. 03:40Bullet Setback Methodology
  5. 05:11Range Testing Setup
  6. 11:11Results and Analysis

Frequently Asked Questions

What were the key components used in the .223 Remington crimp test?

The test used Bob's 223 Bulk Bullets (55 grain FMJBT), 25.0 grains of Hodgdon H335 powder, Federal AR Small Rifle Match primers, and Lake City brass, with an OAL of 2.215 inches.

How did different crimp levels affect accuracy in the .223 Remington loads?

The crimp level had very little impact on accuracy. Group sizes for the tested loads ranged from 1.29 to 2.10 inches across all crimp settings, including no crimp.

Was bullet setback observed during the .223 Remington crimp test?

No bullet setback was observed, even on rounds fired with no crimp applied. This suggests that for this specific load and rifle, a heavy crimp may not be necessary.

What methodology was used to test for bullet setback?

Bullet setback was tested by measuring the overall length (OAL) of the first round in the magazine after firing the subsequent nine rounds, checking for any change in seating depth.

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