03-06-2014, 05:36 AM
Up here in frozen Minnesota I do just as LRRPF52 suggests. My shooting temps can vary from 95* down to -15* so once in a while I end up with some squirrely things happening. Most of the time I can work loads or try different powders to find a muli-weather load. The worst load I have had was a 257 Weatherby, I had 5.50" difference in point of impact from summer to winter. I just have to re zero for warm weather when I use it. I have been trying to keep my Grendel shooting to around 10* - 15* so far. Being new to the Grendel I am sure I will have to do a lot of load testing ant longer ranges to weed out the almost close enough loads.
These are my load development 4 shot groups, 100 yards at 10*, off to a good start.
These are my load development 4 shot groups, 100 yards at 10*, off to a good start.