I'm one of those folks who believe that an long time ago when the 6.5x55, 7x57, 8x57, and 30-06 came about they pretty found the solution to most situations. They do an lot.

What I want is more bullet weight and diameter in an nice handy rifle.

Another option would be the Ruger 375 guide rifle and load it up or down. Weight might be more with the 375 vs the 338 RCM.

What I am really aiming to accomplish is something that is nice and handy and throws 225-250gr slugs. Also want an Mauser type action.

Thank you for your replys. I'll look into CDNN and see if something is available.