This One Tool could change your 22LR accuracy...

Published on September 17, 2022
Duration: 21:44

Testing a rim thickness comparator on .22LR ammunition revealed significant accuracy impacts, especially with high-end match rounds. While bulk ammo showed minimal group size changes, match-grade options like Eley and SK saw divergent groups nearly double in size compared to control groups. This suggests rim thickness consistency is a critical factor for extreme precision in rimfire competition.

Quick Summary

Sorting .22LR ammunition by rim thickness using a comparator can significantly improve accuracy, especially for match-grade rounds. Federal Gold Medal Match and SK Match showed nearly doubled group sizes with varied rim thicknesses, while bulk ammo saw minimal impact.

Chapters

  1. 00:00Intro: Rim Thickness & Accuracy Theory
  2. 01:15Measuring Ammo Variance
  3. 04:55Range Testing Setup
  4. 07:27Results: CCI & Norma
  5. 10:06Results: Federal & SK
  6. 12:58Results: Eley & Conclusion

Frequently Asked Questions

What is a rim thickness comparator and how does it relate to .22LR accuracy?

A rim thickness comparator is a tool used to measure the precise thickness of the rim on .22LR cartridges. The theory is that variations in this thickness, which can be influenced by the primer charge, affect ignition consistency and thus impact shooting accuracy.

Which .22LR ammunition brands showed the most significant accuracy impact from rim thickness sorting?

Federal Gold Medal Match and SK Match ammunition demonstrated the most significant accuracy degradation when using rounds with varied rim thicknesses. Their divergent groups nearly doubled in size compared to the control groups sorted by consistent rim thickness.

Does rim thickness sorting benefit all types of .22LR ammunition?

The testing suggests that rim thickness sorting primarily benefits high-end match-grade .22LR ammunition. Bulk or less precise ammunition brands showed minimal differences in group size or point of impact shift, indicating it may not be worth the effort for those types.

What rifle and scope were used for the .22LR accuracy testing?

The testing was conducted using a stock CZ 457 Varmint Chassis rifle equipped with a suppressor and a Vortex Razor HD Gen II scope. This setup was used to accurately measure group sizes and potential shifts in point of impact.

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