He is a seasoned shooter that weighs about 45kg dripping wet. And I agree that holding it tight back into the shoulder is what he is supposed to do. I am certain that he is as well, but the gun is nearly the same size he is.....and most of his shooting is at a bench standing up. The way I see it, the harder you pull the gun into your shoulder the more it makes the two masses (shooter and gun) into the same mass to be affected by recoil. Thus increasing the resulting rearwards acceleration by increasing the mass.