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Long Range Hunting & Shooting
Cold temp affecting terminal performance of plastic tipped bullets
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<blockquote data-quote="Hand Skills" data-source="post: 1366033" data-attributes="member: 103303"><p>Absolutely. The idea gas law gives us something like this;[ATTACH=full]84537[/ATTACH]Air is like 25% more dense on a cold day.</p><p></p><p>What's interesting is the speed of sound decreases with temperature. One might expect the speed of sound to increase with density. This is called acoustic impedance. I'm no rocket scientist, so while I can't comment on how this affects supersonic pressure envelopes, it's obvious to me that a bullet experiences greater resistance to inertia (and thus friction) during flight on a cold day, just type a cold temp into any balistics calculator. How much influence does the pressure wave around the bullet have on impact? How much bigger is that envelope of super compressed air? I know it's bigger, I can SEE it on colder days.</p></blockquote><p></p>
[QUOTE="Hand Skills, post: 1366033, member: 103303"] Absolutely. The idea gas law gives us something like this;[ATTACH=full]84537[/ATTACH]Air is like 25% more dense on a cold day. What's interesting is the speed of sound decreases with temperature. One might expect the speed of sound to increase with density. This is called acoustic impedance. I'm no rocket scientist, so while I can't comment on how this affects supersonic pressure envelopes, it's obvious to me that a bullet experiences greater resistance to inertia (and thus friction) during flight on a cold day, just type a cold temp into any balistics calculator. How much influence does the pressure wave around the bullet have on impact? How much bigger is that envelope of super compressed air? I know it's bigger, I can SEE it on colder days. [/QUOTE]
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Cold temp affecting terminal performance of plastic tipped bullets
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