Your muzzle velocity will decrease, and your apt to have a totally different percentage of humidity, and a totally different air density.
All this means is your trajectory will be different.
How much, well that would require a call to the psychic hotline, or re confirming the muzzle velocity with a chronograph and cyphering the new data into a ballistics program, or better yet shooting the given load at distance under similar conditions.
Tough nut to crack, eh?
But that's why there are no absolutes.
Shoulda been finding your hunting load in February instead of August in all reality, but maybe you didn't own the rifle back then, who knew, so much would ride on all this till you got hip deep in it.
One last thing, don't be thinking you'll shoot anywhere near the same in the colder temps either, because you'll be dressed like the Michelin man too.
The scourge to all this long range wannabe stuff, is exactly this.
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There are no absolutes
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