Originally Posted by alan-aitch
I suppose you could angle your shot along the side of the tube to skim off a few fps
That's exactly what the steyr shooter in front was doing with the chrono, except it wasn't reading. With a tighter hole to reduce the error of hitting the pendulum in a different place, there's more chance of it happening... and i bet they're a bugger to calibrate.
As usual, shooting airguns outside tests things to the extreme... What do the other formats use, and is it generally accepted?