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Author Topic: On Wthby Mag shoulders  (Read 1999 times)

FMJ

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On Wthby Mag shoulders
« on: February 06, 2010, 07:20:47 pm »
Why does the Weatherby Magnum family of cartridges have such a unique shoulder shape?  It's not angled but it has a curve.  Does this alternate shape offer any advantages in terms of pressure or extraction or anything like that?  Forgive my ignorance, but these are also Africa cartridges, no?
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    JesseL

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    Re: On Wthby Mag shoulders
    « Reply #1 on: February 06, 2010, 07:33:46 pm »
    The ostensible reason for the shape of Weatherby shoulders (which Roy Weather by dubbed "double venturi" BTW), is that it smooths the flow of combustion gasses and lets them attain higher velocities.

    In reality I don't think it does much and I've heard it said that the real reason for the curved instead of sharply angled transitions in the shoulder is to make it trickier for competitors to make chamber reamers for Weatherby cartridges.

    Weatherby has their own cartridges across the whole spectrum of rifle calibers and applications, from the .224 Weatherby Magnum (the smallest belted case ever produced AFAIK) to the .460 Weatherby Mag, which is in the same class of dangerous game rounds as .458 Lott (and even betters the Lott by a fair margin).
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    Grant

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    Re: On Wthby Mag shoulders
    « Reply #2 on: February 06, 2010, 10:38:12 pm »
      I dunno the reason, all I know is that Weatherby's are the king of the heap.

    Well...maybe not 100% but they're good.

       Dad has a .257 and .270 Mags, and swears by them.  Plus they boast about the highest velocities seen outside of super-large-case magnums.

       
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    RandySBreth

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    Re: On Wthby Mag shoulders
    « Reply #3 on: February 07, 2010, 06:44:08 pm »
    Rot Weatherby was a fantastic salesman, but the "double Venturi shoulder" doesn't do much besides make neck sizing a tad harder sometimes.
    And cases wear out sooner. That's all.
    There's several wildcats based on the more popular Weatherby chamberings that are nothing more than "improved" Weatherby cases blown out to a more conventional shoulder angle.
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    FMJ

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    Re: On Wthby Mag shoulders
    « Reply #4 on: February 07, 2010, 07:51:49 pm »
    Does this mean the .300 Wthby Mag is a glorified and a little bit taller .300 Win Mag?  Other than the OAL and the shoulder, both look identical complete with the belt at the base.  And I assume both must use the same primer size.
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    JesseL

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    Re: On Wthby Mag shoulders
    « Reply #5 on: February 07, 2010, 08:04:52 pm »
    Does this mean the .300 Wthby Mag is a glorified and a little bit taller .300 Win Mag?  Other than the OAL and the shoulder, both look identical complete with the belt at the base.  And I assume both must use the same primer size.

    They're both based on a the .300 Holland & Holland magnum case. The .300 Winchester Magnum is shortened enough to run in a .30-06 length action (as is the .308 Norma Magnum), while the .300 Weatherby and H&H both require magnum length actions.

    The Weatherby round has a much higher pressure ceiling than the H&H, which combined with the greater case capacity should give it noticeably better performance numbers than any of the other cartridges mentioned.
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    mnw42

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    Re: On Wthby Mag shoulders
    « Reply #6 on: February 08, 2010, 12:01:52 pm »
    I see this from time to time:
    Pennsylvania"A government is a body of people, usually notably ungoverned." -Book -- "All war is deception" -Sun Tzu
    Quis custodiet ipsos custodies -- omnia dicta fortiora si dicta Latina -- History is scary - It keeps on coming true! -- Ni!

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