I have 2 rifles sako hunter in 308 and tikka t3 in 22.250

I am still deciding which caliber I should pick as a middle rifle in sako 85 hunter not any other brand.
I want it be in between the two I have.
I'm thinking between 243 270 or even 6.5x55 to compliment my other two and will be using only norma factory loads.
I only want one caliber of the 3 mentioned above.
308 (.... ? ....) 22.250
I am using factory ammo Norma soft point 180gr for 308 and Norma soft point 53gr for 22.250.
I would really appreciate your expert opinion on what caliber I should get in sako 85 hunter to compliment my 2 rifles.
Many thanks in advance.
I live in Australia Queensland.
Strictly hunting and rarely range shooting.
Hunting from wild cats,foxes, wild pigs and dingos, kangaroos,deer,camels,buffalo.