I do not own a 338-30, but i have shot it before, I just want to let you know that after 7 rounds, I stopped shooting it. You how how people say "kicks like a mule" ? well, from my experience, the 338-30 kicked like an elephant with full factory loads.......... It doesn't "shove" you back, but it STINGS sooo fast & hard. That was the worst recoil experience I have ever seen, I will never shoot a 338-30
If you want massive knock down power, why are you going with ultra fast / small caliber bullets ? a 375 h&h with 270 gr going around 2600 FPS has more knockdown power that any 338-30. and if you want something that will reach ALL the way out there, try the standard 7mm mag or 300 win mag.
And if you like some "recoil" + range, get a 300 RUM, I own one, and the recoil isn't like a 338-30, however, since my rifle is over 9.5 lbs, the recoil is very managable.