There are several biologist reports on antler development.
Antler Development in Cervidae by Robert D. Brown.
Alaska moose, antler spreads and Boone and Crockett scores by Bill Gasaway.
In Hunting in Alaska by Christopher Batin there is information taken from Gasaway report. If you do not have “Hunting in Alaska”, you are missing out on a real good book.
The one thing I like about Batin book is it is not full of fluff.
The bottom line is Antler size depend on many factors: food, habitat, climate, weather, and of course heredity.