"You said you currently shoot" those calibers but as stated what are your intentions? I have a 300 ultra mag and before I shot it had a muzzle brake put on it , I have shot Antelope and deer with it reloading most of my amo. It is truly quite a gun,I also own a 7 mm mag and do hunt deer and antelope with it, as stated what are your intentions,?they are all fun to reload for as the choices for bullets are many. Good luck.