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<blockquote data-quote="ColdBoreAccuracyHunting" data-source="post: 1300458" data-attributes="member: 98419"><p>When considering position dependent weapon/ammunition/shooter precision and wind, it is the uncertainties that will be the most meaningful. Consider muzzle velocity as an example to follow. An average MV can be recorded using a chronograph but the most important data is the standard deviation. An average MV of 2700, 2800, or 2900 fps for different loads input into most ballistics computers all have the same SD of 0 fps. However, an SD of 60, 40, 20, and 5 fps all have a different meaning to precision. Most ballistics computers can't differentiate between an average MV of 2700 fps with an SD of 80 or an average MV of 2700 fps with an SD of 5. </p><p></p><p>Now consider wind. Again, a computed wind value of 60, 40, 20, and 5 mph all have the same wind uncertainty of 0. A shooters established wind uncertainty of +-5 mph compared to an established uncertainty of +- 1 mph is an apples to oranges comparison with estimating first shot hits to a target at the same range. The same can be said for position dependent precision.</p><p></p><p>If uncertainties with precision and wind can be established, how can this data be used to determine an effective range? In other words, the combination of uncertainties in the shooting environment dictates the range where the edges of the estimated uncertainties match the edges of the desired target.</p><p></p><p>The MRPA will be hosting a free multi-day cold bore accuracy (first shot) hunting class where a group of trainers will instruct how to develop precision and wind uncertainties in a practical field environment and how to use this data to establish a maximum effective range. <a href="http://www.longrangehunting.com/forums/f17/cold-bore-accuracy-course-montana-spring-2017-a-176948/" target="_blank">http://www.longrangehunting.com/forums/f17/cold-bore-accuracy-course-montana-spring-2017-a-176948/</a></p></blockquote><p></p>
[QUOTE="ColdBoreAccuracyHunting, post: 1300458, member: 98419"] When considering position dependent weapon/ammunition/shooter precision and wind, it is the uncertainties that will be the most meaningful. Consider muzzle velocity as an example to follow. An average MV can be recorded using a chronograph but the most important data is the standard deviation. An average MV of 2700, 2800, or 2900 fps for different loads input into most ballistics computers all have the same SD of 0 fps. However, an SD of 60, 40, 20, and 5 fps all have a different meaning to precision. Most ballistics computers can’t differentiate between an average MV of 2700 fps with an SD of 80 or an average MV of 2700 fps with an SD of 5. Now consider wind. Again, a computed wind value of 60, 40, 20, and 5 mph all have the same wind uncertainty of 0. A shooters established wind uncertainty of +-5 mph compared to an established uncertainty of +- 1 mph is an apples to oranges comparison with estimating first shot hits to a target at the same range. The same can be said for position dependent precision. If uncertainties with precision and wind can be established, how can this data be used to determine an effective range? In other words, the combination of uncertainties in the shooting environment dictates the range where the edges of the estimated uncertainties match the edges of the desired target. The MRPA will be hosting a free multi-day cold bore accuracy (first shot) hunting class where a group of trainers will instruct how to develop precision and wind uncertainties in a practical field environment and how to use this data to establish a maximum effective range. [URL="http://www.longrangehunting.com/forums/f17/cold-bore-accuracy-course-montana-spring-2017-a-176948/"]http://www.longrangehunting.com/forums/f17/cold-bore-accuracy-course-montana-spring-2017-a-176948/[/URL] [/QUOTE]
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