Re: best 7mag powder
IMR powders are temp sensitive. Try working up loads with Hodgon powders if thats what yoru concerned about. They usually stay within 20/30 fps, with a 80 degree temp change. IMR and RL powders are horrible about this. I switched over to Hodgon powders as soon as I found this out. I never use to use Hodgon, but now I dont try anythign else. Except for my varmint guns, I use IMR 4198, and 4064.