PPK
There are a couple of other areas where there are discrepancies:
(Keep in mind that these points are ref Standard Rifles...)
1. The max elevation of the comb is centerline of the bore. It can exceed that with a 'Monte Carlo roll' by .5 inches on the off side. (There's no requirement for the comb to be .5 inches below bore centerline.)
2. That 2.25 inch depth/width is for the entire forearm -- not just at the trigger guard area. (The rule actually says: 'including the trigger guard mounts and screws') AFAIK that wording was primarily to eliminate the old Anschutz 54.18s with the thumb extension on the guard...but I could be wrong about the actual reason.
A problem for match directors is that the rules actually allow more latitude for hunter rifles than for standard rifles. (There are no specific forearm width, forearm depth, drop-at-toe or comb height limits on hunters.) At this time, anyone running tech would be well advised to check carefully any hunter that will be used in both classes since some of the new designs -- which are completely legal for hunter -- push both comb height and drop at toe limit for standard very closely. (We used to usually just accept that any legal hunter was legal for standard, but now we should really certify each rifle both ways.)
BTW -- on the subject of stocks but not referring to this question, Mark Pharr told me yesterday that he is developing a new hunter design that is essentially like his current stock but with a forearm that will accommodate people who shoot 'split-finger'.