Proper gun fit is an absolute must at trap. You have about one second, after calling for your target, to identify its angle and break it-which makes trapshooting like rifle-shooting with a shotgun. At the distances trap targets are broken, being off a quarter inch in your gunpoint can mean a lost target.
So your gun must be pointing exactly where you are looking. To see if your gun fits, close your eyes, raise the gun to your face and shoulder, then open your eyes. If you see the two beads directly in line on your ventilated rib, the gun fits. But if they are off, or you see some of the rib in between, the gun doesn’t fit and you should have a good gunsmith adjust the stock accordingly.
Note: Raise the gun to your face and shoulder: Don’t place the gun to your shoulder and then go down on the stock with your face. This causes tension in the neck muscles.
Don’t “muscle” the gun. Instead, hold it lightly with the fore-end just resting across the palm of your hand. This will enable you to point it smoothly and easily.