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Show off.....
Good shootin' there Tex!
Seriously, 5 rounds of each won't tell you everything.
Since they are all pretty good groups, I would try the same loads at other ranges (both closer and farther than 100) holding with the same point of aim, to see which if any holds the flattest trajectory.
Then maybe shoot later in the evening, see which one has the least amount of muzzle flash.
Beyond that, choose the one that gives the best performance with those factors figured in.
(at typical AR engagement ranges, it don't make much difference if you get shot with a round traveling at 3300fps or with a round traveling 3200fps.)
Ian
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