how long have you been shooting center fire rifles?
if you were my son/daughter or niece/nephew, depending on your size, i would have you fire a long action 30 06 and a short action 308 for awhile and have you pick the one you like. You may even prefer a 6.5mm or 6mm/.243 for less recoil than the 30 cal options. Once you master operation and shooting either of those, then we would move up to magnums, if you feel you wanted to go that route.
Starting out shooting a magnum could induce a habit of flinching anticipating recoil and being smacked in the head by the scope while pulling the trigger, that would seriously hamper your chances at hitting your target. Ingraining good habits with more manageable calibers/rifles while growing would help with trigger control and just letting the recoil happen. just my 2 cents......