Maynard is just applying standard F Class rules for factory class to the shoot.
So how many people that have posted about shooting 1/4 moa groups,have posted that they did so according to F Class Rules?
How many posted that they shot those groups at 300 yards?
How many posted that they did so without using sandbags or a one piece rest?
How many posted that they did so prone off of a bipod?
The bottom line is that most people posted 100 yard groups shot off of sandbags or one piece rests,so specifying conditions such as 300 yard groups or no sandbags,will in no way prove or disprove their claims about shooting 1/4 moa groups of of sandbags at 100 yards.