I had a drum teacher once who said you were only as good as you were on your WORST day-that's what you could count on, what was 'in your pocket.'
Most people try to raise the 'top', or peak, of their shooting. It is also beneficial to compare how you do at your worst, to see if this minimum level of performance raises along with the top.
In a real gunfight (or at a state championship) you may be having a bad day. That's when it's good to know what you absolutely, positively know you can do.
Just my HO, of course.
Larry