It appears that it is Canada Third and USA fourth.danielsharpe1634 said:knocked out the Canadian's record by just under 200ft. Good on ya.
So the standings are:
First = Britain
Second = Canada
Third = USA?
http://en.wikipedia.org/wiki/Longest_recorded_sniper_kills
Though it is odd that the wiki article says how the USA guy did it with an M2 Browning MG. In 1967.