I have an old Enfield rifle i am going to re-barrell. I was'nt going back with the .303 chambering. The rifles' action and stock are in good shape, but the barrell is wore out. Model and type is unknown. Looks like a mkv, but not sure. I am going to keep it within .303 chamber pressures, what ever it may be. I was thinking turning into a .30-30 Win, or maybe a .454 casull. Any thoughts? I also handload my own ammo ,so a wildcat is'nt out of the question.