Semisane - that's a leap of faith I'm not sure I can make. Suppose it's windy when I arrive and diminishes over the hour or two that I'm there. Or the punishment of the rifle has taken its toll after 15 rounds. Those kinds of changes can go unnoticed. Even a change from sunshine to cloud cover can affect results. For open sight shooters, I believe subconscious "adjustment toward the bullseye" also occurs when your brain knows you are sending the same missile sequentially.

This needs more study......[8D]