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I fired 5 shots over a magnetospeed and a Prochrono (the old non-digital version). Velocities for 3 of the shots were within 1fps. The other 2 were a bit different (will look up how much), but I'm fairly confident it was due to the Prochrono turning a bit sideways due to wind and muzzle blast.
Three shots were + or - 1fps, one was 10fps different, and one 50fps different.
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