headspace

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head·space

 (hĕd′spās′)
n.
The volume left at the top of an almost filled jar, tin, or other container before sealing.

headspace

(ˈhɛdˌspeɪs)
n
(Firearms, Gunnery, Ordnance & Artillery) artillery the space between bolt and cartridge in a firearm
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.headspace - the volume left at the top of a filled container (bottle or jar or tin) before sealing
indefinite quantity - an estimated quantity
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References in periodicals archive ?
Two types of chamber reamers will be needed: a standard finish reamer and a pull-through type headspacing reamer.
While the extractor does the hardest of work of headspacing the case, the case length is an important control since the barrel's chamber also aids in headspacing.
You can interchange M2 barrels with other M2 machine guns, but of course you then must go through the timing and headspacing procedure before you fire the M2.
357 SIG, but I disagree with what is commonly written about the cartridge headspacing on the case mouth.
Rather than purchase a new barrel, I elected to see if improved accuracy would be obtained simply from better chamber throat specifications and better headspacing.
In order to locate this receiver section correctly, you must be already familiar with headspacing procedures; now is not the time to learn headspacing.