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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

headspace

(ˈhɛdˌspeɪs)
n
(Firearms, Gunnery, Ordnance & Artillery) artillery the space between bolt and cartridge in a firearm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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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.
The rim of the .38 Super is .022" larger in diameter than the body of the case, resulting in only .011" of rim on each side for headspacing. Quite often this would not be enough, and often the blow of the firing pin would move the case forward far enough to cause misfires.
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.
As for headspacing, get a GO and NO GO gauge in .30-06.
Many units still haven't gotten the poster, smart card or video that details the entire timing and headspacing procedure.