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

Published on February 25, 2022
Duration: 0:55

The hourglass effect in 9x21mm cartridges is an aesthetic defect caused by excessive case tightening relative to the bullet. While visually unappealing, it typically doesn't impact function. However, attempting to eliminate it by reducing radial neck tension can lead to bullet setback during cycling, potentially causing firearm malfunctions like failures to chamber.

Quick Summary

The hourglass effect in 9x21mm cartridges is an aesthetic defect caused by over-tightening the case around the bullet. While usually harmless, attempting to eliminate it by reducing neck tension can lead to bullet setback during cycling, potentially causing firearm malfunctions.

Chapters

  1. 00:00What is the Hourglass Effect?
  2. 00:16Risks of Eliminating the Effect
  3. 00:31Functional Malfunctions Explained

Frequently Asked Questions

What is the hourglass effect in 9x21mm cartridges?

The hourglass effect occurs when a 9x21mm cartridge case is tightened excessively relative to the bullet. This creates a visible narrowing, or 'hourglass' shape, in the middle of the brass case. It's primarily an aesthetic defect.

Can the hourglass effect cause firearm malfunctions?

The hourglass effect itself is usually cosmetic. However, trying to eliminate it by reducing neck tension can lead to bullet setback during cycling, potentially causing failures to chamber or other malfunctions.

What are the risks of trying to remove the hourglass effect?

Attempting to remove the hourglass effect by reducing radial neck tension can make the bullet insecure. This insufficient tension may allow the bullet to be pushed back into the case (setback) during firing or cycling, leading to feeding issues.

What is bullet setback and how does it relate to the hourglass effect?

Bullet setback is when a bullet is pushed deeper into the case. It's a risk associated with trying to eliminate the hourglass effect by reducing neck tension. Insufficient tension allows the bullet to move during cycling, causing setback and potential malfunctions.

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