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In NS we are limited to .23 cal and larger, for big game.
I am a .270 Win guy, but was all set up with Federal Premium 60gr Nosler Partitions, for my .223 Rem, in the event the law changed. I was going to limit myself to 100 yards maximum distance and only take broadside or quartering away lung shots. Doesn't matter now, as I just sold my rifle and that ammo.
I see that some are confused between caliber and cartridge.
To answer the OP question, I say .243 Win, but it has it's limits, just like the rest.