I've got a Stiller Predator long action magnum bolt face coming from a group buy, still trying to decide on chambering. It would get used when I go out west to hunt, usually every year. I've got sporter weight 7mm and 338 RUM's and a 30-378 Accumark. I'm leaning towards a heavier platform, either an A2 stock or a PSS like on Shawn Carlock's Canyon rifles with a varmint contour barrel and a brake. It would be a repeater with a Wyatt's mag box. Wonder what kind of velocities the 338 RUM would get out of a 28" barrel with 225 Accubonds and 300 gr SMK's? Any other suggestions on possible cartridges?