Large caliber rifle help

[Keg]

300 win mag or 45-70

[Ronnie41]

Just day dreaming here....If a fella had an assortment of rifles and the most powerful one was 6.5 creedmoor, what large caliber would you recommend? Something that could be used for elk, moose, bison, bear, nilgai, African plains game.

I don't reload and would only want an off the shelf rifle/common cartridge.

Seems like 30-06 or 300 win mag would be the top choices but what say you?

I have killed aoudad,hogs, and 23 plains game from Africa up to Eland with my 300 win mag. I have two Cape Buffalo one shot kills and a Kamchatka Brown bear with the 375 H & H. These two guns will do it all. If I had to choose only one of these it would be the 375 because I can load down or up for what ever I am hunting.

[TxAg]

300 win mag looks like the winner. I like Tikkas but that might be too light.