Getting in your Headspace ~ VIDEO

By John Farnam

Opinion – Headspace

Ft Collins, CO –-(Ammoland.com)- A firearms “Headspace”.

When talking about guns the term, “headspace,” refers to the distance from the part of the chamber that stops forward motion of the cartridge, to the firearm’s bolt-face.

That part of the chamber is sometimes called the “datum-reference.”

When used as a verb, “to headspace” refers to the contact created between this part of the chamber and the feature of the cartridge that achieves correct positioning as the cartridge is shoved forward into the chamber making contact with the:

1. Rim
2. Shoulder
3. Case mouth
4. Belt

7.62×51, 5.56×45, 6.8×43, and most other modern military rifle cartridges “headspace” on the shoulder of the brass cartridge case.

One can only wonder how this will all work with “composite” cases!

Old, mostly obsolete, military cartridges, like the 7.62x54R, 303 British, 30-40 Krag, are rimmed and headspace on the cartridge’s rim.

Most revolver cartridges, 38SPL, et al, are rimmed and headspace on the rim.

Most rimfire cartridges, like the 22LR, are also rimmed and also headspace on the rim.

HeadSpace – Go or No-Go

When headspace is too short, the bolt may not close, nor lock. When headspace is too large, the cartridge case may rupture, or the round may not fire at …Read the Rest

Source:: AmmoLand