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I tested a few .223 loads usin a cheap Chrony F1.  Had a 33fps spread with one load and a 190fps spread with another.  Both loads shoot 1/2-3/4moa.  Out to 400yds.  As far as chrony accuracy, i bet they vary from one to another.  I shot my .45acp thru it and it read around 1,500fps 5 times in a row.  So i knew something was up.  Tried again and it read 850fps wich is more realistic.