Take the 308 and leave the 30 Nos and it's muzzle brake at home.
You have plenty of time to practice, the magnum won't kill anything any "deader" and the brake is just plain inconsiderate to the PH and trackers.
+1
If you need the recoil reduction get a suppressor. If that won't work for you; bring ear plugs for everybody, trackers, drivers and guides. You want them looking trough their binos not plugging their ears.
