Sounds good on this. If food sources play such a large part in antler size, you could have a legal moose one year, and with less browse available in that area the next year, he could have a smaller set of antlers, even if he had the same number of points as last year. Going with three different markers for a 'legal' moose would help. I've played the game of 'is it legal' only to watch as someone who was closer to the moose determined it was and dropped him just down the slope from me. Very sad hunting trip that year.