mquail in Germany they have a minimum caliber restriction to hunt certain animals. I believe it is a 6.5mm there making the .243 illegal.
I am not sure where jolly1 is from but I would guess that is what he is referring to.
My guest would be great to talk to as he has visited the US twice now and has hunted in several of the western Europe countries and Africa & New Zealand.
He did not bring his rifle to the either US trips but he said he could have.
If you would like you can send me a private message and I can try to put you in touch with him!
Like BigDin mentioned, a guide will be able to keep you informed of all the laws and help keep you legal! Non residents in Canada are required to use a guide.