Don't know how accurate it would be but one thing's for sure, it won't hit the same point of aim as when you shoot it from the shoulder. At a police range that I used to frequent, the range officer made a test jig using motorcycle shock absorbers, a carpeted metal frame, and some velcro to hold the gun in position. Quite an abortion but it worked very well with rifles up to 30-'06. Same theory as a Ransom Rest for pistols. Very repeatable and it simulated the body flex of a person.