Indy,
I am not calculating anything there, just clipboard and paste.

Bart Bobbit is one of the best shots at 1000 yars in the world. He has competed for a long time.

I am NO ONE in the accuracy world, but I am in the top .1% of applied math in a recent IQ test [I am 52 but can still do my Jr High math].

I don't think it is a calculation Bart does, and much as a rule of thumb.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps