Rim Sorting 22LR Does it Work?

Published on May 16, 2022
Duration: 10:59

This video investigates whether sorting .22 Long Rifle ammunition by rim thickness improves accuracy. The experiment used bulk Federal Champion .22LR ammunition and a Neil Jones accuracy gauge to measure rim thickness. After testing, the results showed no significant difference in group size (both averaging 1.27 MOA) between sorted and unsorted ammunition when fired from a CZ 457 rifle at 100 yards. The conclusion suggests that rim thickness sorting may not yield measurable accuracy gains with this specific ammunition and rifle setup.

Quick Summary

A test by Moondog 2A found that sorting .22LR ammunition by rim thickness did not significantly improve accuracy when using bulk Federal Champion cartridges and a CZ 457 rifle. Both sorted and unsorted ammunition groups averaged 1.27 MOA at 100 yards, suggesting rim sorting may not be a critical factor for this specific setup.

Chapters

  1. 00:00Introduction: Testing Rim Sorting Theory
  2. 00:56The Theory Behind Rim Thickness and Accuracy
  3. 01:45Using the Neil Jones Rim Thickness Gauge
  4. 03:27Test Setup: CZ 457 Rifle and Targets
  5. 06:07Firing Rim Sorted Ammunition
  6. 06:21Preparing for Unsorted Ammunition Test
  7. 06:31Firing Unsorted Ammunition
  8. 08:33Analyzing the Results: MOA Comparison
  9. 09:35Conclusion: Rim Sorting Effectiveness
  10. 10:00Final Thoughts and Channel Support

Frequently Asked Questions

Does sorting .22LR ammunition by rim thickness improve accuracy?

According to a test conducted by Moondog 2A using bulk Federal Champion .22LR ammunition and a CZ 457 rifle, sorting by rim thickness did not yield a significant improvement in accuracy. Both sorted and unsorted groups averaged 1.27 MOA at 100 yards.

What tool is used to measure rim thickness for ammunition?

The video demonstrates the use of a Neil Jones accuracy gauge to measure rim thickness. This tool features a bar with different thickness measurements, allowing the user to slide a cartridge rim into the appropriate slot to determine its size.

Why might rim thickness affect .22LR accuracy?

The theory suggests that variations in rim thickness can impact headspace and the consistency of primer ignition. A more uniform rim thickness could lead to more reliable ignition and potentially tighter groups, especially in precision shooting applications.

What type of ammunition was used in the rim sorting test?

The test primarily used bulk Federal Champion .22 Long Rifle ammunition. This type of ammunition was chosen because it is expected to have greater variations in rim thickness compared to match-grade ammunition, making it a better candidate for observing potential sorting benefits.

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