?Controled round feed?

Discussion in 'Gunsmithing' started by kc, Jan 12, 2011.

  1. kc

    kc Well-Known Member

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    Please explane in detail what is a Control round feed?
    and can you give an example of a Rifle manufacture who uses this design?
     
  2. Rustystud

    Rustystud Well-Known Member

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    There are two basic ways bolt actions pick up and feed from a magazine.

    One type is the push feed. It uses the magazine lips/rails to guide the round from the magazine to the chamber. Modern rifles that use this type feed include Post 64 Winchester model 70s, Remington 700s, and Savage short and long action bolt actions.

    The second type of feed is the control round feed. It uses an upside down U shaped boltface. The shell head engages up into the bolt face from the magazine as the bolt moves forward. The bolt takes control from the first time the case is engaged. The bolt face kinda looks like a horizontal reloading shell holder. The following rifles use this methodology in transfering the case from the magazine to the chamber. Mausers, Pre-64 Winchesters, Dakotas, Montana 1999.

    Many dangerous game rifles utilize the control round technology. The theory is once a round is engaged it can fall out until it is ejected.

    Nat Lambeth
     

  3. fj40mojo

    fj40mojo Well-Known Member

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    Good explanation.

    Typically controlled round feed actions must feed from the magazine as well. This is critical as it limits OAL of loaded rounds to magazine length ie no loading those heavys way out there to save space inside the cartridge for powder.
     
  4. Code4

    Code4 Well-Known Member

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    The purpose of controlled round feed is to prevent double feeding of rounds into the chamber and is highly desireable in combat and when hunting dangerous game.

    Once the first round 'pops' out of the magazine onto the bolt face it is trapped there (usually by the extractor in Mauser systems) with no where to go and is then moved forward into the chamber. A second round can not be moved by the bolt into the chamber until the first either fired and ejected or ejected unfired. The empty case is also trapped on the bolt face until ejected.

    In the heat of battle the controlled round feed bolt system prevents a soldier who fails to withdraw the bolt fully (this is called 'short stroking' the bolt) from double chambering the next round when pushed forward again causing the rifle to jam and cease operation.
     
  5. Camshaft

    Camshaft Well-Known Member

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    If i am not mistaken my new Savage model16 in 300wsm is a controlled feed.
     
  6. J E Custom

    J E Custom Well-Known Member

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    Controlled actions have there place and on a military rifle they perform very well with
    ammo designed for them and with plenty of magazine clearance.

    They also provide an extractor that can't disengage in the battery position making it
    les likely to leave a stuck case in the chamber.

    The push feeds have many advantages for the hunter or long range shooter because
    COL is not an issue and you are not required to use the magazine to engage the extractor.

    It is less likely to damage the bullet tip if set up correctly.

    And again if set up properly the chance of getting two rounds in front of the bolt are non existent.

    Most of the modern assault rifles now use the push feed system with great success and only some
    of the bolt action rifles still have the controlled feed.

    Of all the action systems I prefer the push feed actions with a center feed magazine and with a
    pined extractor like the M 16or the Weatherby. The Remington extractor works well when well
    maintained (Cleaned).

    The idea of the controlled feed system was to assure that it worked under the worst conditions
    (Like Trench warfare).

    J E CUSTOM
     
  7. shortgrass

    shortgrass Well-Known Member

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    I think that big 'claw' was probably easier to manufacture when the Mausers and Springfields were "cutting edge technology". No CNCs then.