Well it used to be 500. Now it is 1000, 5 years from now it will be one mile. Today's rifles, optics, rangefinding and ballistic data are making it easier and easier. 500 yards today is an absolute chip shot, you don't even need to be good at the fundamentals at that range.
Five years from now will be three miles. right now everybody is getting into the 1-2 mile realm