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I'm sure someone somewhere can debunk this, but if it were brass monkey cold outside, wouldn't the barrel steel contract some, rendering the bore a little smaller in diameter, and wouldn't that smaller bore diameter somewhat affect velocities? Conversely if it were blazing hot, wouldn't the bore diameter be somewhat larger, thus affecting velocities of ammunition fired from that same firearm?
I guess I wonder whether powder temperature is the only variable.
Or stated otherwise, even if you had a cartridge inside your jacket, taped inside the armpit or something so it was nearly 100 degrees f., and then placed that cartridge in a chamber of a negative 40 degrees rifle, and fire it quickly, would it still perform as it would if ambient temps were 100 degrees f.?
I sure don't know.
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