It is very difficult, to say the least, to field judge a rack. There is no substitution for years of being in the field and seeing a variety of different sized deer. Every rack is so unique, and everything comes into play: mass, tine length, width, number of tines, it all adds up really fast. I shot a buck that is 19 inches wide, 10 pointer, nice long tines, just a huge looking buck. He scored 127. My brother shot a deer a couple years ago that was inside the ears, also a 10 point, and fairly short tines. We guessed 115 tops. He measured 137 because his mass was so heavy, and carried through the whole rack so well. Its amazing how different each deer is.
The best way I have learned has been to just be out there, and I've been fortunate enough to see big and small deer in the field. Ive gotten trail camera pictures of deer, and then seen the same deer on a hunt, that is a big help. the third part of that equation is if you shoot the deer to confirm your estimates. You can get some practice watching shows and reading magazine articles, basically expose yourself to as many different sightings of bucks as possible. Try to guess their score based on hall mark features you can pick out, like are they inside or outside their ears. In proportion to their width, how talll do they seem to be? How many points? Do the points look thin like spindles, or do they look average? Do they look heavy? All those things come together to give you a rough guess. But it takes practice, any way you can get it, but nothing beats hitting the field.
I guess I don't really have anything that directly addresses what you're looking for. But that's my point of view from experience, anyway. Good luck on your hunt!
There are threads on this forum where guys have posted their pictures of deer they have shot. Many of the guys have also posted what the deer measured. So cruise around on this site, and find the threads where guys have posted their trail camera pictures, and their harvests. There is a ton of them on here, and you can get some good ideas.