Good information here from Jim Casto. The bale & bridge will work for everyone who does it properly.
The key on the bridge is that if you have a shot that's less than you developed on the bale, immediately stop shooting for the day. Then at your next practice session, go back to the bale and emphasize correcting the less than. Don't say "well the next one will be right". It probably will be, but you've lost an opportunity to discipline your shot.
The gradual step back of the bridge introduces just a little more stress at each step. Once you get back to 30 yards, you will have a shot that you trust to run subconsciously. You will also have confidence in your shot which will serve you when you are shooting at live animals.
Hope this helps,
Allen