I originally posted this info some years back, but its too much effort to go & try & find it, so ...
There is a dif in finding where a gun shoots & where it shoots for you. The best method of doing the latter was described to me by a well known & charismatic 'pig' shooter named 'Billy'. His method consisted of taking an old thread bare sheet and stretching it between two pine trees, then drawing a circle aprox 6" in dia. w/red lipstick in the centre. Next he would back up the recquisite distance that he thought he would be first shooting the target from [vis a vis, visually acquiring the target & locking in on it] and then after turning partially away from the sheet he would turn back toward it and fire BOTH bbls at the red circle target as soon as it was acquired. After roughly a box of cartridges he could detect an area of overlap or darkening & that was where the gun was shooting, for him w/that particlar load. How much adjustment to make to the stock is a simple matter of doing the math from the distance involved as Rocketman advocates; of course the distance will likely be dif., but you need only change the values as necessary.
This is not the same thing as seeing if the bbls. are properly regulated. Perhaps this will help someone out. I was major bearing a conundrum when first confronted w/the issue .... how does one determine where their gun shoots? This is the best answer & method that I know of; it is both dynamic and practical, moreover it is wholey accurate and takes into account both bbls.
If the bbl. regulation is off, that's a dif. horse and one that should be broken before trying to ride this one.
Hope this does not sound pompous, its not intended that way at all, but it is a subject that cannot be underrated if one intends to absolutely know where his gun shoots w/a given load. FWIW, the method can be as easily utilized w. a single bbl. repeater.
It can also sometimes show you about 'staying in the gun' or the advantage of using a load w/less recoil, if you don't/can't stay in it. NO AIMING, just natural quick shooting, as fast as you can .. for accurate assessment.
kind regards, tw
