[headquarters]

Originally Posted by Hybris

http://en.wikipedia.org/wiki/.30-06

very common in Sweden.

My guess:
most common calibers in Northern Europe today are

30-06
.308
6,5x55
.223

fair sprinkling of
7,92x57
9,3x63
7,62x39

I suggest that the Poles might have alot of 7,62x54R