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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How to check a Chronograph?
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<blockquote data-quote="Tumbleweed" data-source="post: 566109" data-attributes="member: 9281"><p>For the tech at Shooting Chrony to tell you to check your chrony accuracy by running factory ammo with a "known velocity" through it is crazy. There are simply WAY too many variables for factory ammo to run what the factory rates it at-such as minor little things like barrel length. That "test" will not do you any good. I too have been through the headache of not knowing which chrono to trust. What I did was perform a drop verification to 1000 yards and recorded drop information at a few distances in between 100 and 1000. I then compared that info to JBM's drop data with Bryan Litz's ballistic coefficient for my bullet. I started with inputting the velocity I got from my chrono and then made input adjustments to the program until my actual drop and the predicted drop matched. This worked great and gave a LOT of peace of mind.</p></blockquote><p></p>
[QUOTE="Tumbleweed, post: 566109, member: 9281"] For the tech at Shooting Chrony to tell you to check your chrony accuracy by running factory ammo with a "known velocity" through it is crazy. There are simply WAY too many variables for factory ammo to run what the factory rates it at-such as minor little things like barrel length. That "test" will not do you any good. I too have been through the headache of not knowing which chrono to trust. What I did was perform a drop verification to 1000 yards and recorded drop information at a few distances in between 100 and 1000. I then compared that info to JBM's drop data with Bryan Litz's ballistic coefficient for my bullet. I started with inputting the velocity I got from my chrono and then made input adjustments to the program until my actual drop and the predicted drop matched. This worked great and gave a LOT of peace of mind. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How to check a Chronograph?
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