So it's been mentioned by a couple users here that H380 might not be my best option living in a colder climate. Varget has been suggested as a better option, and I'll pick up a can of it as some point. I'm guessing that there's not an exact formula that will predict performance variations due to temperature changes, but I'm curious about how big the changes are. Again, i'm sure it will vary, but is accuracy effected hugely or just slightly? I could probably live with an inch or so, having shot factory ammo all my life, that'd probably be within that normal variation anyway. Though if things go way off I'll definitely be looking in to the Varget sooner rather than later. Are factory bullets very subject to temperature changes or are more temp stable powders used in those?