Magnumitis is correct ,I'll add few things though( 375 h+h I own and love)The 375 ruger fits in standard action the h+h magnum chamber.SO you can carry around the ruger in a lighter rifle.I'M not really sure thats a good thing felt recoil and all.But everybody is different,the h+h is about my limit to shoot comfortably off the bench with out a muzzle break.375 h+h amo can be found around the world.The difference in time it takes cycle a cartridges is measured in milliseconds...thats my 2 cents...I'm not trying discourage from buying it you can never have too many guns