Here in my part of Oz it's currently 0C (32F) so pretty cool.

I have noticed that my ancient Annie 1411 Match 54 does not perform as well with Eley Tenex at below 10C as it does when warmer days happen.

I have resorted to keeping my Tenex ammo under my armpit or using Lapua Polar Biathlon which is designed for the cold but not as quite precise.

So why don't rimfire ammo like cold days and why?

* doggie *