I never have been able to shoot a round group in rapid prone. I generally string vertically. The only time I averaged much above 90 offhand was when I dry fired 30 times every night offhand, and had an air rifle range in the basement. Air rifle at 10 meters will make you tough. Its easy to see your mistakes in sight alignment, sight picture, and trigger control. The wind is tough. A Marine coach at Perry taught us to place the butt out of the pocket and actually on the arm. The rifle is then laying across your chest (don't know if it's legal) for more support. That keeps the rifle from blowing around, but doesn't stop you from blowing around. In the wind, I end up with the trap and skeet approach: See the bull flying toward my front sight and slam the trigger when it gets there. Dry firing a lot helps. Builds strength to allow you to hold in aiming position long enough for a lull in the wind to allow a controlled shot.
Gotta go for a while.
Regards
J.R.
"I never have been able to shoot a round group in rapid prone. "
I think that's common. The recoil upsets your position. Using that spray adhesive might help.
My problem with standing relates to my sleeping habits. I spent the last ten years on second shift and I can't seem to wake up. The first relay causes me to be sleepy, shaky and a bad disposition. I've noticed that it takes a week for my body to get on the early shift so I can shoot a match. I shoot with country types that are up at 5 AM. I have an IDPA match this weekend and I was up until two yesterday. Since I help to run the match, I can delay my shooting all the way until 10:00.