Cool. I don't get into the why or how that much, just it works or it doesn't. STrange how different minds work.
Like a chrono and low readings ES/SD... I don't much care, I want to know ballpark speed. The lowest ES/SD that I've had have produced some of the worst groups.
I see how small (or not) the group is on a target at my max distance.( 1800 plus yards target was a 55 gallon drum. LOL. I was super glad to eventually drop 3 shots into under 12 inches there for sure)