I just shot the Surefire Texas Multigun (big 3 gun match) and boy was it a learning experience! I learned to expect the unexpected, and to plan for it. I learned that I do not practice in nearly enough unusual positions.
On the plus side, I did learn that regularly shooting matches with targets 350-500 yards makes shooting rifle at an average of 60 yards quite easy (even offhand) and taking headshots at 40 yards is a piece of cake