Put 2 fingers of, your Left Hand on the Top of the Forend, LIGHTLY, alongside the Barrel to keep Muzzle "Flip", down, a bit.
Wear, the Past Recoil shield ! Good "move" putting, the Limbsaver Pad, ON !
Locate Butt Pad, OFF your Shoulder Bone,.. closer IN, towards, Neck ( the Meaty part of, Shoulder ) and hold, Pistol grip, Firmly
( Pulling inward, towards Shoulder ) But don't go crazy on holding, Firmly !
Concentrate on,.. Breathing, Cross Hair Position and Trigger squeeze.
Do you have a PADDED Cheek Riser on, the Comb of Stock ?
I have / use, a Ballistic Nylon one that, Straps on buttstock with, NO shell holders. Good Luck !