Get a neck sizing die only, as long as you only load that brass in that rife. The initial stretch is the first firing. After it has been fired it fits the chamber of that rifle. If you full length size it will keep streching to fit the chamber. Neck sizing only lets it stretch once. Would get over 10 reloads in a 300 H&H, less perhaps if you go MAX loads all of the time. Primer pocket will be the first to go. Quality brass of course.
