I have a .338 RUM with a 25 inch barrel. Only drawback is shooting it with out the muzzle brake is brutal and punishing. I need to check on the +P throat. I am a firm believer of the Wyatte's box, but I'm not sure I want to stuff any more powder into that case. I don't shoot any bullet heavier than 225 grains. Make sure and pick your shots. That bullet at RUM velocities can destroy a lot of meat. A friend of mine witnessed an bull elk shot shot head on in the chest and the bullet exited. It made a awful mess.