That's pretty damn good. But there is a fair old helping of luck at that range (had a former Army chap explain some rifle ballistics to me a few years ago, shortly after the Canadian set the record. The Canadian's bullet fell by 40 feet during that incident!). Still outstanding.
For about thirty years (before the Canadian) the long-standing record of over 3,000feet was set by an American, a Green Beret IIRC, in Viet Nam. He used a .50 cal mounted on the back of a jeep for that one!