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Bottom gun. I leave the skyscreens off on cloudy days. Even with high thin cloudiness, the chrongraph should work well without screens. The screens are used on bright sunny days to reduce the "glint" from the bullet. I guess it confuses the "eyes" that use the shadow of the bullet or something.
Steve M. If you want the neasurement to be a reading at 15 feet, place the chronograph so that the center, between the two "eyes" is at 15 feet. If it is not that important, place the start screen 15 feet out and let it go at that. I doubt that the velocity will change that much, and some rifles have sufficient muzzle blast that a screen closer than 15 feet will have more error messages than not.
Paul B.
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