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Air Temperature Effects On Muzzle Velocity By Gustavo F. Ruiz
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<blockquote data-quote="Pdvdh" data-source="post: 322964" data-attributes="member: 4191"><p>Mikecr,</p><p></p><p>I'll let Gus respond, but I believe the intent of the article was to describe how, once the preferred load has been developed for a rifle, a person can chronograph MV at a few differing ambient air temps (I believe a minimum of 4 temps & this assumes cartridge and rifle are also at ambient air temperature), and then use this statistical approach to model MV at other temperatures reasonably accurately, based solely on the original set of chronographed MVs at the known temperatures. </p><p></p><p>In practice, having collected the MV data for your pet cartridge/rifle combination, and having the ouput from the statistical modeling merged into the Patagonia ballistic software - then when one collects the atmospheric conditions in preparation to determine corrective dope for the long range shot, the ballistic software will modify the MV to match the actual air temperature, resulting in corrective dope that will most accurately match the catridge's MV in those ambient air temperatures.</p><p></p><p>If you're going to keep your ammo in your pocket at body temperature and load and shoot before the gun's chamber cools or heats up the cartridge, then it wouldn't be appropriate to rely on ambient air temperature to model MV. But, if you're ammo and rifle are allowed to reach ambient air temperature, then for at least the first shot, the use of this statistically modeled MV value in the ballistics engine would yield a close to correct MV and dope.</p><p></p><p>I happen to own and use the Patagonia software so I could follow the intent and application of article. It was not meant to cover all possible affecting aspects of air temperature on MVs. Chrono MV at a minimum of four different Air Temps, allowing rifle and cartridge to reach ambient air temperature prior to shooting over the chronograph. Enter the MVs and matching air temps values. Premise is that MV will then be statistically modeled to closely match actual MV at the current conditions ambient air temperature. The modeled MV value then gets cranked through the ballistics engine to provide the best corrective dope possible for the shooter's ambient air temperature.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 322964, member: 4191"] Mikecr, I'll let Gus respond, but I believe the intent of the article was to describe how, once the preferred load has been developed for a rifle, a person can chronograph MV at a few differing ambient air temps (I believe a minimum of 4 temps & this assumes cartridge and rifle are also at ambient air temperature), and then use this statistical approach to model MV at other temperatures reasonably accurately, based solely on the original set of chronographed MVs at the known temperatures. In practice, having collected the MV data for your pet cartridge/rifle combination, and having the ouput from the statistical modeling merged into the Patagonia ballistic software - then when one collects the atmospheric conditions in preparation to determine corrective dope for the long range shot, the ballistic software will modify the MV to match the actual air temperature, resulting in corrective dope that will most accurately match the catridge's MV in those ambient air temperatures. If you're going to keep your ammo in your pocket at body temperature and load and shoot before the gun's chamber cools or heats up the cartridge, then it wouldn't be appropriate to rely on ambient air temperature to model MV. But, if you're ammo and rifle are allowed to reach ambient air temperature, then for at least the first shot, the use of this statistically modeled MV value in the ballistics engine would yield a close to correct MV and dope. I happen to own and use the Patagonia software so I could follow the intent and application of article. It was not meant to cover all possible affecting aspects of air temperature on MVs. Chrono MV at a minimum of four different Air Temps, allowing rifle and cartridge to reach ambient air temperature prior to shooting over the chronograph. Enter the MVs and matching air temps values. Premise is that MV will then be statistically modeled to closely match actual MV at the current conditions ambient air temperature. The modeled MV value then gets cranked through the ballistics engine to provide the best corrective dope possible for the shooter's ambient air temperature. [/QUOTE]
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Air Temperature Effects On Muzzle Velocity By Gustavo F. Ruiz
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