Per my other post, how much does the temperature differences summer to winter play in accuracy, POI, and all. Will the same powders group just as tight, just at different POI or will groups vary. I am trying to work up loads for 22-250 and 223 for a p-dog hunt. Won't be no -15 degree's when I'm out their! Want to start loading up and working up loads though. I'm using Varget, H380, and IMR4064. Thanks!