Best all rounder rifle?

[DLRX]

Different terrains require different calibers.
Different animals require different calibers.

Bushveld -
Small to Medium Game: 300Win Mag / 7 x 57 / 8 x 60
Big Game (Eland etc): 300 Win Mag / 375
Buffalo: 375 / 458 / 500NE etc

Open Veld Hunts (where stuff is at distance)
Small Game: 270 / 7x64
Big Game: 300 Win Mag

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Or just buy a .308W for the non big 5 stuff..