Measuring muzzle velocity: instrumental vs actual


Q: I have been measuring bullet velocities with a Chrony chronograph. I am told that the result is the instrumental velocity of the bullet at a point between the muzzle and the Chrony which is positioned 12 feet from the muzzle when using my .300 Remington Ultra Mag.

How do I convert this figure to velocity at the muzzle?

— Theo Taylor

A: Why would you bother? If the screen of your Chrony is reasonably close to the muzzle you can expect to lose 1fps for each foot of range. Therefore, if the Chrony is situated 12 feet from the muzzle, you would be losing 12fps.

Your reloads will vary more than this from shot to shot. So why waste your time?

To quote the bard: it’s “much ado about nothing”.

 

 

 


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Nick Harvey

The late Nick Harvey (1931-2024) was one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He wrote about firearms and hunting for about 70 years, published many books and uncounted articles, and travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject was unmatched. He was Sporting Shooter's Technical Editor for almost 50 years. His work lives on here as part of his legacy to us all.

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