I have no doubt that a match target air rifle has the capability of constant accuracy. Certainly over 10 metres. The pellets have improved dramatically over the years. However the pellets such as H and N Matchkugeln have always been excellent. These are then sifted and specially selected to produce a consistent projectile. The bench test equipment is a complicated design. We tried many years ago to replicate the process at our club. It was a disaster. Might be easier with a PCP. I've never tried it. However Robin said that he saw the process whilst at MEC. That's proof enough for me. He is also right that in theory a human might replicate the bench test. What isn't in doubt is the unbelievable accuracy these air rifles are capable of.