Some years ago, I called Lake City Army Ammo Plant about an accuracy issue with some 7.62 NATO match ammo our team was issued. After resolving the issue, the ballistics engineer I talked with told me the following.....
A new hire was helping him test a lot of match ammo shooting many dozens of shots on their 600 yard test range. They got the target with a couple hundred holes in it with an extreme spread of about 8 inches. That young ballistics enginner mentioned to the old timer: "Wow, look at all those half-inch 5-shot groups on that target." To which he replied: "Yes, 5-shot groups that tiny at 600 yards are very impressive." Then the youngster replied: "Yes, that's right. Too bad they're not all at the same place in that 8 inch cluster." The senior engineer's final comment in so many words: "You'll be good to have around testing ammo for accuracy. You understand better than most folks what ammo accuracy is all about, what proper testing will show and how to interpret the results."
Fliers? There ain't no such thing as fliers. Every shot fired goes exactly where the ammo, rifle and shooter positioned the muzzle axis to put that bullet in flight as it left the barrel. Where that axis points is determined by the quality and repeatability of those three parts of the shooting system.