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extractor groove

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extractor groove [ik′strak·tər ‚grüv]
(ordnance)
Groove machined in the base of a cartridge case, a short distance above the head, which receives the extractor of the breech mechanism and permits the case to be withdrawn by the extractor; used in automatic weapons, in preference to extractor rims (flanges) formed on the cartridge case base.


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According to NAA, "Behind the neck, all case dimensions and configurations, including the extractor groove, rimless case, cartridge diameter and bolt-face engagement are identical to the .
This keeps tension on the extractor so that it always rises to engage the extractor groove of a case in the chamber.
While I plan to regularly clean the rear face of the barrel, extractor grooves and bolt face of my 77/22, I doubt that I'll scrub the bore any more frequently than every 1,000 rounds.
 
 
 
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