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Optimum .300 wm Barrel Length

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Unread 06-02-2011, 12:16 AM
Junior Member
Join Date: Dec 2008
Location: Kimberly, Idaho
Posts: 8
Re: Optimum .300 wm Barrel Length

Liltank is right on the money your gonna need a 30+ inch barrel. But that being said you need to look at practicality to of the weight and length of the gun. I've always been taught that the 308 to achieve full/maximum powder burn in theory needs a 36 inch barrel. So I'd bet you'd need close to that if not a few more inches.

I'm sure somewhere there is a formula or formulas to calculate powder burn and expansion of gas in the barrel. But thats bound to change with heat, and powder types.
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    Unread 06-03-2011, 06:26 PM
    Gold Member
    Join Date: Jul 2010
    Location: Mount vernon, OH
    Posts: 681
    Re: Optimum .300 wm Barrel Length

    Those are some crazy long tubes. There is a law of diminishing returns. After 18 inches I would be shocked to see a .308 gain more than maybe 50 FPS per inch. I think a 1/10 twist at 26" is just the ticket( I hope so thats what my Krieger #10 mtu is) . Beyond that the results aren't really appreciable and the rifle soon become a bench queen.

    I mean look the the .338 edge guys drilling bears at 1200 yards and dropping them in their tracks. They are using .30 inch tubes.

    "Let glorious acts more glorious acts inspire,
    And catch from breast to breast the noble fire!
    On valour's side the odds of combat lie,
    The brave live glorious, or lamented die;" - Iliad, Book V
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    Unread 06-03-2011, 10:24 PM
    Silver Member
    Join Date: Oct 2009
    Location: Northeast MS
    Posts: 388
    Re: Optimum .300 wm Barrel Length

    I have a 300wm with 26" bbl and my accuracy load with the 208gr Amax is at 2845fps. I have pushed the 208 to 2900-2925fps with retumbo, but accuracy suffered. If I were starting from scratch and building a 300wm, I would go with a 28"bbl that with a muzzlebrake would be right at 30" total length. With a 28"bbl you should be able to get to 2925-2950fps safely with the 208 and 210gr.
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    Unread 06-04-2011, 09:30 AM
    Silver Member
    Join Date: Mar 2009
    Location: Michigan
    Posts: 449
    Re: Optimum .300 wm Barrel Length

    28" to 30" would be the general direction that I would go. Thanks for the great advise guys.
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    Unread 06-17-2011, 10:45 AM
    Junior Member
    Join Date: Jan 2011
    Posts: 29
    Re: Optimum .300 wm Barrel Length

    Currently running a 28'' Rock Creek mtu contour. 72 grains of 4831 sc and 208 amax gets me 2955 2965 fps, that is my accuracy load. Gun weighs 17 and a bit, next barrel will be a 1.25 straight Rock at 29.25.
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