Bob, yes that is a well known method of guaging the sight picture. It certainly has the desired effect, but I often wonder if people initially shoot better when they have been told that the gun fits them? They then go out and concentrate on the bird.Until the wheels fall off, then they look for another reason for bad form such as choke, too much? or too little? How many of you have had 'new gun syndrome' picked up a new gun or borrowed one, and have then shot like a god only to slump back into your old form a little while later?
Recently I had a sponsored Perazzi, custom fitted stock, factory deal, the full nine yards, laser fitting machine, trip to Italy etc., Long story, short version, 5 stocks later, I nearly got comfortable with a stock that they said didn't look right.By this time I'm thoroughly cheesed off and return to my old baby. ( Not a Perazzi)
You can't put a price on success, try the gun, shoot the gun, pattern the gun, but at the end of the day it's what works for you.
Some people like to see a lot of rib, some people like to see no rib, some people like to see a bit of rib.
Your not some people, your an individual.
