I have been toying with the idea of buying a 9.3x62 for some of the bigger critters in North America and African plains game with the notion of having a substantially greater effect when the bullet collides with said animal in comparison to the 30-06 with 210 LRABs or 200/220 NPT.

Is there really a huge difference between the two when it comes to putting the bullet in the right place?

I am also curious as to which cartridge offers the cut off point where you will truly see a noticeable difference from a 30-06 with heavier bullets?