Thread: Effects of cartridge temp on velocity

Originally Posted by wsm junkie

I read just yesterday on a US forum a guy tested this. His smith built his rifle and testfired it at sea level, the rifle and remainder of the box of ammo was then shipped it to him, he lives at 4000 feet and when he tested the left over ammo he got the same velocity as the smith.

Altitude simply effects air density. So does temperature. Temperature normally decreases with altitude (the amount varies depending on humidity) so they were probably shooting in the same "thickness" of air.