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Thread: Pope Barrels

  1. #1

    Pope Barrels

    Hi Bill

    How do you think Harry Pope Lapped his barrels since they had gain twist.

    Regards
    Graham

  2. #2

    Friend Deveng

    Quote Originally Posted by Deveng View Post
    Hi Bill

    How do you think Harry Pope Lapped his barrels since they had gain twist.


    Regards
    Graham

    _____________________


    Friend Deveng:


    You've asked a most interesting question.


    I don't know the answer.



    I guess one could use either a very short lap, or, a long lap that was cast fairly cold, so as to be loose in the bore.



    But neither one of the above methods, at least as far as my lapping experience has taught me, will lap a bore properly.



    So I really don't know how one would "properly" lap a gain twist bore.



    By the way you're correct, as this new book on Pope, that Rembrandt gave me, does say that Pope did cut gain twist rifling.


    Your friend, BC


    _____________________



    PS:


    Keep after your 4 lever trigger......




    One other thing:


    Back in those days, I wonder how someone like Pope went about producing the rifling guide to produce a gain in the twist rate, and, how they went about varying the rate of gain so they could spearment to find the proper amount of "gain" so as to produce the best accuracy?
    Last edited by Bill Calfee; 4 Weeks Ago at 06:41 AM.

  3. #3

    A possible way

    Hi Bill

    If Harry Pope had a curved guide bar on a sine bar rifling machine I think that would do the trick.

    And if the curve is a progressive curve then you could start at different positions along it for different gain rates.

    Regards
    Graham

  4. #4

    Friend Deveng

    Quote Originally Posted by Deveng View Post
    Hi Bill

    If Harry Pope had a curved guide bar on a sine bar rifling machine I think that would do the trick.


    And if the curve is a progressive curve then you could start at different positions along it for different gain rates.

    Regards
    Graham
    __________________________


    Friend Deveng:


    I agree......but.....


    Here's Pope's rifling machine.....


    According to the book, Pope rifled by hand, this so he could "feel" if the cutter hung up, even slightly.



    Also notice that he used hog fat as a cutting fluid.


    Your friend, BC




    ________________________


    PS:

    From reading the book, it looks like the rifling head was stationary and the barrel was pulled, by hand, in the fixture mounted on the lathe bed, which rotated the barrel to the twist rate he wanted......

    If this is correct, it makes it even more difficult as to how he adjusted the rate of "gain".
    Last edited by Bill Calfee; 4 Weeks Ago at 02:12 PM.

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