That would very much depend on which 30 cal.

There is a hell of a difference between a .30-30 and a .300 WBY

Could you be more specific.

Personaly I wouldent shoot a 30 cal at any of those through choice, but I prefer slower speeds and heavier bullets.

I guess at those speeds that it is a 30-06 or .300 H+H.

I would opt for the 200 woodleighs.

Regards