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  1. #1

    Default A question to all gun smiths

    I have a theory that i would like to run past you guys about harmonics. The harmonics of a rifle is caused when a bullet travels down the barrel, what is the link between the twist cut into the barrel and the harmonics? Because the metal wil move and expand in the weakest spots more than the rest, when the bullet travels down the barrel with all that pressure and heat behind it. So, the twist cut into to barrel will be a weak spot. So if the twist is clockwise and 1/10 and .25mm deap, and one cuts a anticlockwise twist 1/10 and .25mm deap on the outside of the barrel. The two should in theory cancel eachother out... do you agree?** I would love to hear your feedback on this.

  2. #2
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    Default Re: A question to all gun smiths

    From an engineering point of view, that simply isn't how the physics of barrel expansion/contraction and shock wave propagation work. Do a youtube search for exaggerated examples of barrel expansion as the bullet passes down it to get an idea of the elastic nature/deformation of the barrel. The lands/grooves do not negatively affect the performance of the barrel in the way you suggest, and neither would machining the outside of the barrel (for example, fluted rifle barrels).

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    Default Re: A question to all gun smiths

    What would you want to achieve with this? The rifling will have no appreciable influence. The barrel is essentially a rod with a hole through it. The fact that the hole has a funny shape, and that the shape rotates about the axis of the rod as you move down the length of the rod doesn't mean that the bending stiffness of the rod changes as you move down the length of the rod, because there is always the same amount of material around the axis of the rod. Cutting in your reverse rifling will just give a funny, shape to the outside of the rod, that also rotates as you move down the rod, and still not change anything.

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    Default Re: A question to all gun smiths

    Quote Originally Posted by ARM505 View Post
    From an engineering point of view, that simply isn't how the physics of barrel expansion/contraction and shock wave propagation work. Do a youtube search for exaggerated examples of barrel expansion as the bullet passes down it to get an idea of the elastic nature/deformation of the barrel. The lands/grooves do not negatively affect the performance of the barrel in the way you suggest, and neither would machining the outside of the barrel (for example, fluted rifle barrels).
    Well explained.

    Also, I can not see how the average gunsmith would be qualified to answer the question. The issue does not seem to be part of their training curriculum. Some may have learned it in their own research?



    Have you visited the intro section yet?

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