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Questions about the Forcing cone

Discussion in 'Mossberg 935 Magnum Autoloader' started by Frank Lopez, Aug 7, 2011.

  1. Frank Lopez

    Frank Lopez Copper BB

    Messages:
    2
    Hello all,

    I'm new here and I have a question. I don't own a 935 (I have an 835), and this question came up on another board. I know that the 835/935 guns are bored to .775 and that the chamber is at least .798 in order to meet SAAMI requirements. This alone would indicate the existance of a forcing cone. However, some folks are stating ther there is no forcing cone and others have stated that there is a sort of step from .798 to .775 (which I don't buy). Anyway, I've checked my 835 and am positive of the existance of a cone.

    So, my question is, does a forcing cone, in the traditional sense exist in the 835/935 guns.

    Thanks for any information.

    Frank
  2. oli700

    oli700 12g Supporter "Philanthropist"

    Messages:
    9,284
    There is an obvious size decrease. The way I understand it in Mossberg’s it is a step and not a cone shape. It is referred to as a forcing cone for any shotgun…..forcing cone being the term for this particular transition zone, in the barrel, from chamber to bore no matter how it is configured or modified . At least that’s the way I see it.

    Welcome to Mossbergowners Frank
  3. SHOOTER13

    SHOOTER13 Guest

    Welcome to the Mossberg Owners Forum Frank !!

    When you find the time, post a pic of your Mossy 835... :mrgreen:
  4. Frank Lopez

    Frank Lopez Copper BB

    Messages:
    2
    I just checked my 835 again, and there definitely isn't any step or shoulder. I used a very straight rod with a perfectly square nose and slowly pushed it along in the chamber. If there was a definite shoulder, it would have hung up or stopped or at least have a noticable feel to it. No such luck. I think the next thing I'll do, just to remove all doubt, is to make a plaster or wax casting of the chamber and the first inch of the barrel.

    The one thing that makes me believe that there is a con and not a shoulder is that since it is a 3.5 inch chamber, it can also shoot 3, 2 3/4, and smaller shells. While a shoulder might work with the long shell, it would cause problems with the shorter stuff.

    Frank
  5. oli700

    oli700 12g Supporter "Philanthropist"

    Messages:
    9,284
    Hmm , let us know. Hopefully gumbydammit sees this. He is one of the guys at Vang Comp and could tell us for sure .....I thought my 500 had more of a step.
  6. gumbydammit

    gumbydammit .270 WIN

    Messages:
    163
    On some shotguns, you'll actually see a step, or abrupt taper. Others use a gradual taper, to form the forcing cone.
    If you were to use a bore gauge, you would see it.
    Mossbergs are known for their rather generous bores. We don't get as much "meat" from them when we bore them.

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