logdog,
Maybe so, but the least amount of velocity change in any cold-test I've done was a .223 Remington with Ramshot TAC. The string fired at zero averaged EXACTLY the same as it did at 70. That had to be pure chance, as chronographing two strings of the same ammo within minutes of each other normally results in a few fps difference--but it still indicated the cold-weather velocity was very close to warm-weather velocity.
I will definetly remember Ramshot TAC, when looking for 223 powders.. Good info!!
When I said "unchanged" I should have specified a little more.
I really meant that it didn't change enough to take me out of my node...
