I can only offer how mine likes to be shot. Left hand placed just at the back of the split in the bottom of the forend, and supported at the wrist only enough to balance, with almost no contact on the shoulder. I have to be careful with the location of my left hand, as to not put any pressure on either side of the stock. The left hand acts as a vertical support only. This is a little more difficult to get used to at first, due to the forend being fairly wide on the Tommy. After a little practice the hold becomes intuitive. With this hold my tommy is a real tack driver.