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    WSM

    WSM

    Rugeritis
    Oct 8, 2009
    6,364
    Lancaster, PA
    stevespages.com is listing a Lost River Ballistics manufacturer of bullets .277 135gr with a BC of .649! That is by far the highest BC I've seen for a .270 bullet. Anyone know anything about this company? They don't seem to have a website and apparently their products are hard to get. Also, would a BC that high stabilize in a 24 in. 1:11 twist barrel?
     
    shadow116

    shadow116

    2nd Class Citizen
    Feb 28, 2008
    1,542
    Emmitsburg
    WSM said:
    stevespages.com is listing a Lost River Ballistics manufacturer of bullets .277 135gr with a BC of .649! That is by far the highest BC I've seen for a .270 bullet. Anyone know anything about this company? They don't seem to have a website and apparently their products are hard to get. Also, would a BC that high stabilize in a 24 in. 1:11 twist barrel?
    Click to expand...

    Yeah Lost River Bullets are hard to find. They made lathe turned bullets with crazy high BCs, but those were G1 BCs and not G7 which would predict their ballistics better.

    Anyway, the BC of a bullet has no bearing on what will or will not stabilize in a particular barrel. The weight, or more specifically the bearing surface of the bullet, is the determining factor in what will stabilize or not.
     
    alucard0822

    alucard0822

    For great Justice
    Oct 29, 2007
    17,687
    PA
    There are a lot of factors that determine the RPM that is required to stabilize the bullet, generally a VLD bullet will have a longer straighter taper to the ogive, and longer boat tail taper, and if it is lathe turned brass, it makes it even longer than a jacketed lead core bullet, more or less higher BC= less brg surface/longer bullet and faster twist needed. Higher velocities also can help stabilize a bullet being the BC actually changes somewhat at different velocities, and of course the faster it trucks down the barrel, the faster the rifling will spin it, rifling shape and efficiency can also play a role, then there are the oddball barrels that won't stabilize a bullet they should, and those that stabilize a bullet they shouldn't.

    Ideally a 7mm bullet about the same weight (closest size I have worked with) in a 7mm/300WSM case would work well in a 1-9 to 1-10 twist rate, and could work with a twist even a little slower especially under 500 yards, you should almost certainly be OK in a 1-11 270WSM, even with a brass or guilding metal solid but there is only one way to know for certain.
     
    bulletbill

    bulletbill

    Agent provocateur
    Dec 31, 2008
    2,908
    SW FL
    WSM said:
    doesn't higher bc mean longer bullets? longer bullets = faster twist to stabilize?
    Click to expand...

    No not really it just means better bc. You could have a VLD of a given length and a Spitzer type bullet of the same length. "Generally" the VLD would be lighter and carry a higher bc that the sptizer of the exact same length. The spitzer to match the length of a VLD would be allot heavier and more importantly the bearing surface would be extremely long with lower overall bc. But just because a bc is higher does not automatically mean longer bullet.

    BC is more a function of shape as it relates to atmospheric drag rather than solely on length.
     
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