Headspace (firearms) | Wikipedia audio article
Channel: wikipedia tts
Date: 04/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Headspace_(firearms)


00:00:54 1 Cartridge types
00:03:08 1.1 C.I.P. ammunition approval procedure and headspace
00:04:16 2 Theory
00:06:11 3 Gauges
00:07:53 4 Other cartridge dimensions



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SUMMARY
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In firearms, headspace is the distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt.  Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning.  Different cartridges have their datum lines in different positions in relation to the cartridge.  For example, 5.56 NATO ammunition headspaces off the shoulder of the cartridge, whereas .303 British headspaces off the forward rim of the cartridge.
If the headspace is too short, ammunition that is in specification may not chamber correctly. If headspace is too large, the ammunition may not fit as intended or designed and the cartridge case may rupture, possibly damaging the firearm and  injuring the shooter.