Depends on whether the barrel is jacked up. If the barrel is crap and has stress than it will "walk" and groups will string in a line consistently. Very few do this. What really is going on is that "groups" get bigger as you shoot more rounds (at least to a certain number, and then the group stays the same), and 5 or 10 round groups are bigger than 3.
Think about what size dot at 100 yards that you know without a doubt that on demand you would hit with every single round fired. Hint - it ain't a half inch dot.
