Which one should be my third rifle and why...

[Killo]

Really good suggestions so far. I recommend venerable 300 H&H. You can buy some factory rounds. With a 30 cal your reloading options are vast. Brings a little class to any hunting camp you visit.

Bravo!!

 

[SStomcat]

Something you can find ammo for at most stores.

Very imp. point, I plan to reload for this calibre albeit occasionally, and use factory ammo mostly. Loading for the 9.3 and 470 will take up the free time I have.

 

[Killo]

My 3 rifles for Africa
300 H&H
375 H&H
416 Rigby

 

[FlyGuy]

Very imp. point, I plan to reload for this calibre albeit occasionally, and use factory ammo mostly. Loading for the 9.3 and 470 will take up the free time I have.

You’re short a faster, flatter cartridge as a third…
Something with a good supply and wide variety of factory ammo…
7mm Rem Mag would be a solid choice.

140-160gr if you’re hunting plains.
175gr if you’re headed to the bush.