Len,
With my left arm across my chest i squeeze the base of the bag with my left hand. The grip i use is a little more difficult to explain, its not a hard hold that causes my fingers to turn white(i have seen this alot)but a firm hold pulling the butt snuggly to the shoulder. I have tried both wrapping my thumb around the grip and leaving it not touching, although there is no difference in felt recoil the latter method gives me more confidencein controlling recoil. When i wear short sleeved shirts i always rest my elbow on a pillow bag(a days shooting can remove some skin /ubbthreads/images/graemlins/frown.gif)
My cheek touches with light pressure and i keep my mouth open so as not to transfer my pulse to the butt. /ubbthreads/images/graemlins/grin.gif
I learned these techniques shooting HV benchrest and although i prefferred the free recoil technique,this is impossible in heavy recoiling gun, unless you have a gun that weighs 50lb plus. /ubbthreads/images/graemlins/smile.gif
Centre Punch.