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Hunting
Long Range Hunting & Shooting
Cold temp affecting terminal performance of plastic tipped bullets
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<blockquote data-quote="Bigaldepr" data-source="post: 1525844" data-attributes="member: 102210"><p>Just some basic physics: The speed of sound in a gas is dependent on temperature and the molecular weight of the gas. Since we only shoot here on earth the speed of sound is only dependent on temperature. It has to do with how fast the molecules are bouncing around hitting each other. From this a bullet with the same MV can be supersonic on a cold day and subsonic on a warm day at the same point down range. The viscosity of air varies directly with temperature so on a cold day there is actually less drag and the bullet remains supersonic further down range. Except that the density of air varies as the inverse temperature and directly with pressure so the shock wave off the tip of a supersonic bullet tends to slow it down faster with higher density. Conclusion: There is a complex set of factors that effect the trajectory of a bullet and the longer the shot the more complex it gets.</p></blockquote><p></p>
[QUOTE="Bigaldepr, post: 1525844, member: 102210"] Just some basic physics: The speed of sound in a gas is dependent on temperature and the molecular weight of the gas. Since we only shoot here on earth the speed of sound is only dependent on temperature. It has to do with how fast the molecules are bouncing around hitting each other. From this a bullet with the same MV can be supersonic on a cold day and subsonic on a warm day at the same point down range. The viscosity of air varies directly with temperature so on a cold day there is actually less drag and the bullet remains supersonic further down range. Except that the density of air varies as the inverse temperature and directly with pressure so the shock wave off the tip of a supersonic bullet tends to slow it down faster with higher density. Conclusion: There is a complex set of factors that effect the trajectory of a bullet and the longer the shot the more complex it gets. [/QUOTE]
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Cold temp affecting terminal performance of plastic tipped bullets
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