Hello, you've gone all quiet at the thought.
Here's my two pennorth, pull it to bits at will:
No part of the body or the rifle combo shall have contact with any external structures natural or man-made, other than both feet shall be on the ground, or on the shooting platform if there is one.
Posture shall be erect and upright, i.e., body essentially vertical with knees not significantly bent, and top of head at proper height above feet.
The shooter alone must support the entire weight of the rifle and fitted accessories.
Rifle must be shouldered and not shot from the hip.
Muzzle to be beyond the firing line.