ACtually, the way most shooters crawl up a stock is the 'Weird " postion. The one I describe is a shotgun variation of the Turret handgun position, where you for am isoceles triangle with your shoulders and arms on the gun. I have seen people shooting shotgun slugs from short barrel police guns with the stock butt against their breast bones, the heel of the stock below their neck, and the gun " aimed " with the entire upper body, just like the cannon on a Tank turret( hence the name of the stance).
Everyone's Experience differs. I never was comfortable with the Turret stance, because I had spent years perfecting the Weaver stance with handguns. I can use the Turret Stance when shooting a handgun, but I prefer the Weaver.
I know an instructor and expert shooter, who has a school that teaches the shoulder only mount technique to his students, and they regularly leave at the end of a week breaking moore skeet, trap, and sporting clays targets then they did before they took his courses. I don't shoot my shotgun his way, because I never took his course. I have changed my stance shooting shotguns over the years as I had guns fitted to me, and learned what I needed to be doing to break more targets, and take down birds more often than not. I still hunt doves, just to keep me humble, tho'. They are the only birds that can " stop on a dime, and give you back change", and you just are not going to hit every dove you fire at. :thumbsup: