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thanks all. I will try moving back to 20ft. and see if there is a difference.

How accurate are these chronographs. I just bought one and tested out a couple of loads for my 270 WSM. 70gr of Reloader 19, Rem 91/2 primer, winchester brass, 130gr Hornady bullet, 24 inch barrel in my Sako A7 rifle. registering velocities of 3759, 3768, 3761 fps = seem way too fast...