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Muzzle velocity correction?

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Unread 05-23-2009, 05:30 PM
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Location: Chatham, VA
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Muzzle velocity correction?

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.
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  •   #2  
    Unread 05-23-2009, 05:35 PM
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    Re: Muzzle velocity correction?

    Just realized JBM does it...nevermind 3921 is the predicted actual
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