Which caliber for varmint shooting in the wind?

[NAM70]

I've always believed that the first bullet arriving at the target was the one least deflected by the wind. But I'm probably wrong again. Interesting discussion. Dave

[PartsMan]

The most wind defying varmint cartridge that I ever hunted with was the 22-243AI using 75-80gr bullets at considerable speed.

Wow, that sound like one heck of a varmint round.

[victorcharlie]

I.

.. I was amazed and am now working on a 9 twist CZ 223 barrel but will have it chambered to use the 204 case...

The 204 is a .222 Magnum case necked down to 20 caliber......

What you'll wind up with is a .222 Magnum......

[Coyote Hunter]

Bullet weight is wholly irrelevant. Wind drift is a product of BC and TOF.

You are correct that bullet weight is irrelevant.  Bullet MASS, however, generally referred to in its Newtonian derivative as WEIGHT, is a major factor in determining BC.   So if you are considering BC you are also considering weight/mass as well.  

It is hardly “irrelevant”.

[PartsMan]

I think he meant that you don't need to consider weight if you have the B.C.
Weight has already been figured in the B.C.

[nomosendero]

I.

.. I was amazed and am now working on a 9 twist CZ 223 barrel but will have it chambered to use the 204 case...

The 204 is a .222 Magnum case necked down to 20 caliber......

What you'll wind up with is a .222 Magnum......

The 204 is a 222mag case alright, but blown out as well.

[victorcharlie]

Shoulder angle changed from 23 to 30 degrees on the .204..... 

A .223 would be my choice, simply for the availability of brass....

[SingleShotShorty]

I like a 243 shooting 70 gr Ballistic tips or a 308 shooting 125 gr Ballistic tips