Cold weather ammo reminder

[catnthehat]

Thus topic comes up on a pretty regular basis in the winter . Some shooters pay attention to it while others do not pay particularly close attention to the rapture extremes.
Last weekend we were shooting from 600 meters to 1K,
And one of our shooters had not had his long range rifle out all Fall.
When he checked his zero at 500 and went into his log book, he found that he had to dial in 4 full MOA into hus elevation.
His load was developed in August , and we were something like -19c on Sunday.
At 100 yards on a deer one might not notice the difference , but once you get " out there" the difference is quite dramatic depending on the powder .
The powder in this case IIRC was IMR 4350 in a 260 Remington.
The elevation change on my .223 using Varget was pretty much on from a 200 "0" , to 500, to 600, less than 1MOA the first day I tried it out there.
Cat