I have a Beta Master Chrony. If I take a Sharpie and put a black ring around the bullet out in front of the ogive, will the chrony see that ring and be more accurate. I have a plastic drill bit diameter guide so I thought I could use it to be precise and consist with the sharpie ring. Is this stupid or not? The book does say that the eye sensors detect the change in the amount of light. Has anyone tried this?