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Thread: Destroyer 9mm Largo

  1. #41
    Boolit Master
    Join Date
    Jan 2010
    Location
    Space Coast, FL
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    1,445
    Could not take it anymore trying to remember and went and dug mine out. Controlled feed bolts have an open area usually flush to bolt face at 6 o'clock allowing cartridge base to slide up face and slide under the extractor. Single feeding requires the extractor to force itself around rim going into battery putting a lot of stress/bend at the thin spot just forward of collar. Probably many a Mauser and 03 have been massaged to allow (get away with) this but at the cost of claw engagement on rim. Push feed usually has a full circumference rim with a spring loaded extractor allowing single feed with no harm. Looking at this bolt and the small rim (mine has been opened up for 45 Auto) and the tenderness of these extractors and being made of unobtainium I will not be single feeding. This design to me appears to be a controlled feed only even having the small rim. The designers probably felt that with extractor at 12 o'clock the rim was needed at 6 for extraction and control of round. With rim being small enough still allowing controlled feed design as cartridge is pushed forward from magazine angling up under extractor and then captured by bolt face for alignment with chamber.

  2. #42
    Boolit Master
    Join Date
    Mar 2013
    Location
    Northeast
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    1,267
    Interesting info.
    Bear with me...I don't have the rifle here to examine and I've never fired one before.
    Basically, if you load a single round, the extractor has to jump over the rim when you close the bolt. If the bolt picks up a round from the mag, the extractor doesn't have to jump.

  3. #43
    Boolit Master
    Join Date
    Jan 2010
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    Space Coast, FL
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    1,445
    Correct! As round is pushed forward rim slides up behind claw instead of being pushed through it.

  4. #44
    Boolit Buddy blackbahart's Avatar
    Join Date
    Jan 2015
    Location
    British Columbia Canada
    Posts
    126
    Gtek got her spot on ,just feed from the mags and one should be good !Tks for explaining

  5. #45
    Boolit Master
    Join Date
    Mar 2013
    Location
    Northeast
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    1,267
    Thanks for the explanation, Gtek. Nice catch, Multigunner.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check