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











