The difference between the fastest and slowest loads quoted is 111 fps. This is hardly a large variation -- in fact, individual shots in a string can easily vary as much using one load and one gun. I have no problem at all believing all of these loads are "NATO spec", the differences in velocity being because of the guns or fixtures they were tested in, the exact protocols under which they were tested, conditions on the days they were tested, etc., etc.

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Pisgah