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Shooting a .30-06 Bannerman Mosin

Discussion in 'Rifle Country' started by Ian, Apr 1, 2013.

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  1. cal30_sniper

    cal30_sniper Member

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    One also needs to take into account the shear stresses involved, defined as one half the difference between the principle stresses. In this case, the principle stresses are the hoop stress and the radial stress. The Shear Yield Stress (SYS) is approximately 75% of the Tensile Yield Stress (TYS), and the Ultimate Shear Strength (USS) is approximately 58% of the Ultimate Tensile Strength (UTS).

    Given those conversions, the SYS and USS of the steel in question should be about:

    SYS: 43.5ksi
    USS: 82.5ksi

    Given the hoop and radial stresses I already calculated, below are the shear stresses for each rifle at each location:

    Inner Region:
    7.62x54R Mosin: 57.1ksi (70% of ultimate)
    M2 Bannerman: 61.9ksi (75% of ultimate, 108% of Mosin)
    .30-06 Bannerman: 74.3ksi (90% of ultimate, 130% of Mosin)

    Middle Region:
    7.62x54R Mosin: 12.1ksi
    M2 Bannerman: 23.0ksi (190% of Mosin)
    .30-06 Bannerman: 27.5ksi (230% of Mosin)

    Outer Region:
    7.62x54R Mosin: 5.1ksi
    M2 Bannerman: 11.9ksi (233% of Mosin)
    .30-06 Bannerman: 14.3ksi (276% of Mosin)

    So, in the inner region of the .30-06 Bannerman, not only are you dangerously close to the Ultimate Tensile Strength, you are dangerously close to the Ultimate Shear Strength as well. And that's under perfect conditions without imperfections or stress risers.
     
  2. NeuseRvrRat

    NeuseRvrRat Member

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    who let the engineer in?
     
  3. plateshooter

    plateshooter Member

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    If I had that rifle, I would shoot low pressure cast bullet loads in it and enjoy it for what it is. Could you post a pic of the rifle?
     
  4. goofyoldfart

    goofyoldfart Member

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