Re: .338 rum, help me narrow down the powders.
The Barnes recommended .050 off the lands and that is where I loaded them. The Noslers I would start with .010 off the lands and see how it shoots. I shot 3 boxes of nosler 250's and couldn't get them to group in my rifle with 4 different kinds of powders and all sorts of seating depth's.
Stay away from the RL powders, the hotter it got here in Az. the hotter my test loads got. I have had no temp issues with H 4831SC they shoot the same place all the time.