You might think that dragging wood has something to do with bringing wood into elk hunting camp.
It may, but in today's context it concerns a type of poor trigger control.
If you ever have a target that looks like the one below you may be "dragging wood." Dragging wood, does not necessarily mean your trigger finger is really dragging. It may mean that the flex of your trigger finger is exerting pressure on the stock or pistol grip just enough to push the rifle to the left, or to the right for a left handed shooter.
Dragging wood doesn't have to happen on EVERY SHOT. It may happen only a few times. Check your targets for good groups in the center, with only one or two shots out to the left. Additionally, the errant shot(s) are not always directly at 9 o'clock. They could be anywhere from 7 to 10 o'clock.
Simply adjust your grip on the pistol grip. Most sporting and hunting rifles have long enough pistol grips to allow individual adjustments. Remember, dragging wood doesn't always mean "dragging." It may be caused by big or fleshy hands, especially on the first joint above the palm. If you look carefully, dryfiring will help you spot the solution without expending lots of ammo.
Built up pistol grip on my space gun. It is important to NOT BUILD up too much were the web of the hand fits--that may transmit different movement to the rifle. Build up more were the palm fits. This pistol grip has also been cut off so it is shorter. This allows a lower prone position. In U.S. highpower shooting there are no rules on how low your position can be. International shooting rules address the permissible angle of the forearm.
Go shoot and have a blast!