I am currently loading 69.5 gr H-4350 (70.0 is max) with a 180 Accubond in a 300 WM. F-215 primer and Norma brass. The cases are all new and the shoulder stretch to case fire is .014. It's a factory chamber so it is a little big. My velocities are only getting up to 2920 fps with the 24" barrel. I have been thinking about trying RE-22 or H-1000 but I have heard the RE-22 isn't as stable with temperature changes. Will the velocity increase now that the brass is case fired? Does anyone have good advice for any of these powders? Thanks.