Che cosa è l'effetto clessidra del 9x21 #short

Published on February 25, 2022
Duration: 0:55

This video explains the 'hourglass effect' in 9x21mm cartridges, a cosmetic issue caused by over-tightening the case neck during reloading. While primarily aesthetic, excessive tightening can lead to insufficient radial neck tension, potentially causing bullet setback and chambering failures. The speaker, exhibiting high authority, advises against aggressively eliminating this effect to maintain proper cartridge function.

Quick Summary

The hourglass effect in 9x21mm cartridges is a cosmetic issue from over-tightening the case neck. While not inherently dangerous, attempting to eliminate it can reduce radial neck tension, leading to bullet setback during cycling and potential chambering failures. Proper tension is key for reliable function.

Chapters

  1. 00:00Definition of the Hourglass Effect
  2. 00:16Risks of Eliminating the Effect
  3. 00:31Functional Malfunctions

Frequently Asked Questions

What is the hourglass effect in 9x21mm cartridges?

The hourglass effect in 9x21mm cartridges is a cosmetic defect where the brass case appears narrowed in the middle. It occurs when the case neck is tightened excessively during bullet insertion during the reloading process.

Is the hourglass effect dangerous for 9x21mm ammunition?

While the hourglass effect is a defect, it's primarily aesthetic. The main concern arises if eliminating it leads to insufficient radial neck tension, which can cause bullet setback and potential chambering failures.

What causes bullet setback in reloaded 9x21mm cartridges?

Bullet setback typically occurs when the radial neck tension is insufficient, often a consequence of over-crimping to remove the hourglass effect. The firearm's cycling action can then push the bullet deeper into the case.

How can I avoid malfunctions related to the hourglass effect in 9x21mm reloading?

Focus on achieving adequate radial neck tension for secure bullet retention rather than aggressively eliminating the hourglass effect. Ensure the bullet is held firmly, even if the case shows a slight narrowing.

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