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I, too, have very good luck with MagPro on my .300 WSM and with a variety of chamberings. RL-17 is another. As with everything else, YMMV. I am propelling 215 Berger at 2850 FPS out of 22" barrel using RL-17. If you run the numbers to 1000 yards, it is no slouch.
Good Morning, I am just curious about the reach for extra velocity out of a short barrel rifle with the case already at max capacity? Seldom does extremely high velocity result in the best accuracy. More powder is seldom the answer, especially when the case is at 100% and dealing with such a short barrel. If you were to shoot the firearm and watch from the side you will invariably see a large plume muzzle flash. That is powder burning outside of the barrel where it will do absolutely no good. Short barrels are a trade off, ease if handling for a lesser muzzle velocity. If you want to increase the MV then try a lighter bullet, or better yet quit the search for a higher velocity and turn your search toward accuracy. A bullet hitting exactly where you want it is more valuable to a hunter than one that goes fast but doesn't hit its mark.
I don't disagree with you, but OP is maxed out on case capacity with no pressure. Without going to compressed load, he needs a faster powder.
