Since the deer are killed in the Fall, long before they drop their antlers in Feb. and March, your inquiry is not particularly relevant. However, even after an antler is shed, it continues to shrink. The reason that the 60 day rule exists is because of hundreds of years of experience, and a desire to compare current " champion " racks, to those that may have been taken more than 50 years earlier.
Sadly, every year, someone has a rack that seems like it will just barely break the prior record, only to have it shrink enough that it does not. I have friends who are B&C certified rack measurers, who do hundreds of deer racks each year. They have scored some record bucks in their days. But they have also scored hundreds of also- rans. They have dozens of stories about arguments with the owners who thought their racks were a new record, based on measurements taken before the 60 day drying required period.