Chronograph in my 6.5x47

[Swarovski1]

Not sure if my chrony is right or wrong or i am lucky or unlucky.this evening I thought I would check my 139gr scenar load to see what velocities I am getting for the bal cal.jeez the 39grs of RS60 were giving 2900 fps plus.no pressure signs.i thought I would try a few 140gr amax loads which are also on 39grs of RS60. They too were doing 2900 fps.somehow that seems a bit fast.they shot well aswell.100 shots ago the amaxs were doing between 2800 and 2813fps.