I know how to shoot. I guess you missed the part where I have a collarbone that grew back wrong. It impedes the butt of a gun from seating right. Its fine in smaller calibers. I have problems with magnum loads and large rifle calibers sometimes.
I had to learn to shoot all over after the injury. I should have just shot left handed after that.
I don't have a weak side. I'm ambidextrous. I have an old climber stand made from aluminum. It is lightweight. You face the tree though. Anything off to the right of me needed to be shot left handed. I shoot left handed. I just haven't practiced shooting with a 12 gauge left handed.
I'm not sure that it was that one instance that did it. I assumed it was. I just woke up sore the next day and it got worse and worse. I don't remember it hurting me when I shot.
I have proper form and know how to shoot. I have been hunting with a shotgun for 20+ years. That is squirells, rabbit, turkey, quail, pheasant, deer, pigs, you name it, I've hunted it. Out of all those years and thousands upon thousands of shells this is the one and only time I've injured myself.
I guess I'm getting older and maybe its time to retire the 12 gauge magnum rounds and go back to shooting 20 gauge.