all 3 are solid choices.

for cheap/available ammo, I'd lean to the .243 and the .270
I don't find .2506 ammo everywhere....

Knockown power.....I give it to the .270...

accuracy....all 3 I think can be super accurate, my .270 is awesome with 130grs.

But I'm guessing the .243 could beat all 3, but it wouldn't be by much I don't believe.

I think the .270 wins in your contest....