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Long Range Hunting & Shooting
Ballistic calculator
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<blockquote data-quote="Mr1Fixit" data-source="post: 2306838" data-attributes="member: 80781"><p>I'd encourage you to remember that all the computers do is model your performance. If you have a load that shoots with a consistent velocity (small velocity SD), the ballistics should be repeatable as evidenced by the groups you shoot at distance. My suggestion is calibrate your model - make sure your inputs for everything you control and measure reliably are as good as you can make them. Then calibrate the trajectory model out to your max range by adjusting either velocity or ballistics coefficient (they have similar effect on the calculation, if I understand it correctly). I have done that for a 7mm WSM of mine and found it good past 1200 yards on targets after changing the velocity input from what I had chronographed to what matched the observed trajectory. I think what you see in the real world is the best basis for your model.</p></blockquote><p></p>
[QUOTE="Mr1Fixit, post: 2306838, member: 80781"] I’d encourage you to remember that all the computers do is model your performance. If you have a load that shoots with a consistent velocity (small velocity SD), the ballistics should be repeatable as evidenced by the groups you shoot at distance. My suggestion is calibrate your model - make sure your inputs for everything you control and measure reliably are as good as you can make them. Then calibrate the trajectory model out to your max range by adjusting either velocity or ballistics coefficient (they have similar effect on the calculation, if I understand it correctly). I have done that for a 7mm WSM of mine and found it good past 1200 yards on targets after changing the velocity input from what I had chronographed to what matched the observed trajectory. I think what you see in the real world is the best basis for your model. [/QUOTE]
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