At our last junior high power team training session, to demonstrate wind effect and correction. To understand the mirage in a subtle fishtailing wind, we had our top shooter on the mound at 600 and shot with no wind zero. The rest were asked what would be their correction one by one before each shot, then compared their call to the shot placement. It was a good case study, the wind took the shooter from 9 o'clock to 3 o'clock, he posted about 2 inch vertical, spanning slightly less than the 10 ring width, shooting with no wind correction. The condition prevailed, he could have possibly cleaned it with no wind zero on the gun, assuming he stayed on the waterline.
If a shooter were chasing the spotter and making full value corrections, and not paying attention to the max and min and wind cycle, he could be in trouble in that subtle fishtailing wind. Those ugly 8s, and occasional 7s might just show up depending on the hold and cone of fire.
When I legged out in 96, we were shooting at Camp Bullis. At 600 yards, its notorious fishtailing condition was at its best. The fast dropping wind netted a bunch of folks 7 on the right, followed by a 7 on the left. As I was studying the wind while scoring, I noticed its repeating characteristic, though it dropped off fast, it stayed in the boil long enough by timing it that I could get off a couple of shots, before it reversed. Contrary to what I heard not to shoot in the boil, my strategy was to shoot one shot in the boil. When it was my turn to shoot I stuck to my strategy, no wind zero. First shot was a 10 at 3 just outside the 10 ring. I shot the entire match with no wind zero on the gun, and posted a 198. No one was even close to it. I won the match and legged out. Talking to other shooters after the match, no one believed that I was crazy enough to shoot in the boil, after all we've told not to shoot in the boil.
BTW, never saw another condition like that and have not shot in boil since.