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 ?
Headspacing here is the just the difference between the front of the bolt and the back of the barrel where the rim fits.
The next step in the building process is headspacing the original Imbel bolt to the barrel.
Two types of chamber reamers will be needed: a standard finish reamer and a pull-through type headspacing reamer.
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.
I finally sent it off to Bill Wilson, who installed a new barrel, cut for headspacing on the mouth of the case and the problem was solved.
357 SIG, but I disagree with what is commonly written about the cartridge headspacing on the case mouth.
Having the gauge specifications and SAAMI drawings in hand will enable you to unravel headspacing questions easily.
On fitting any replacement barrel to a Savage 110 style receiver for switch-barrel use, I seldom use the Savage barrel lock nut headspacing system.
In order to locate this receiver section correctly, you must be already familiar with headspacing procedures; now is not the time to learn headspacing.
Remove the extractor as some self loaders will headspace by the extractor instead of correctly headspacing on the cartridge case mouth.
Another mistake Soldiers are making during headspacing and timing is not pulling the charging handle back to the 3/8-in hole in the receiver while another Soldier screws in the barrel.
Many units still haven't gotten the poster, smart card or video that details the entire timing and headspacing procedure.