I have never shot at a range. I have wondered how they measure the small groups like .200" in benchrest shooting. How are the targets set up so the holes are clean enough to measure that accurate? And what do they measure with? I have a 220 swift that shoots groups that measure very roughly 5/16" to 3/8" at 100 yrds. but hard to tell exactly for the holes aren't clean. This is by drawing a circle around the outside of all the holes as close as I can tell where the outer edge of each hole is. Do they measure by drawing a circle around all the holes? Or bullet hole center to center.