I advocate striking down on the back of the golf ball on EVERY SHOT except a bunker shot (I’ve covered this in several posts - see Archives below). The intention is to slightly compress the ball by forcing it into the ground (always at an angle - we’re not hammering here). This produces a unique sound & keeps the ball flight lower & thus you don’t have to over torque your body to put plenty of force on the ball to get good distance and better accuracy. This technique of striking the ball generates far more confidence that you can execute a shot. Obviously you have to think about sand differently since it’s soft & if you strike down on the back of the golf ball it will simply bury it deeper in the bunker or go squirting off in some unknown direction.
So we have all kinds of sand even wet sand. What to do? If the sand is fluffy & dry you can cut across the ball diagonally & by hitting down but with a shallow angle on the club a few inches in front of the ball you can drive the club under the ball and lift it out of the bunker & with the right touch get it fairly close to the hole (I’ll get into wet sand below). The MONGOOSE GOLF SWING is a lever-swing and involves the hands substantially more than the conventional swing at the point of contact. By learning to lever the lower hand and using your left hand as a fulcrum point (think teeter totter) you can amplify the force with little effort.
For long bunker shots without obstruction (such as a high bunker lip) use a 5 iron if you think you need a 4 iron. When I’m in a bunker I’m more interested in making good contact with the ball than how far I think I can hit it. I always grip down a bit (maybe an inch) to heighten my grip strength. Concentrate on the ball with your eyes and make solid contact and let the rest take care of itself. I imagine the golf ball is the size of a tennis ball. It seems to help over the last 60-years or so.