The 8X68S is a very good cartridge. It might not be as fast as the 300Weatherby but it puts a bigger hole in what you are shooting at. For this reason I would compare it to the 8mm Remington Magnum. It is not as powerful or fast as the 8mm Rem but not far behind it and less recoil.

Very good choice of calibre in my opinion. Go and enjoy it.