Muzzle velocity correction?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Forester, May 23, 2009.

  1. Forester

    Forester Well-Known Member

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    Mar 23, 2008
    Is there a calculator out there that will give me an actual (predicted) muzzle velocity correction based on how far the Chrono was from the muzzle? I was doing some load development today with my new 204 ruger build but the hay was so high I had to sit the Chrono twice as far away as I usually do to get it on the right height.

    For what its worth accuracy seemed to get better as charge weights increased. At 28grs of 4895 under a 40gr V-Max I got very light primer flattening and 3878fps 30 feet from the muzzle. Barrel is a 10 twist Shilen. ES from charge weights 27.8 to 28 was only 15fps.
     
  2. Forester

    Forester Well-Known Member

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    436
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    Mar 23, 2008
    Just realized JBM does it...nevermind 3921 is the predicted actual