I am not sure if this has been posted before but it is something I have been thinking about for a long time. One of the biggest debates I have seen on this forum is, "Is this moose legal?" The only way to tell for sure is to measure it. Now this is hard to do on a living moose but not impossible. The secret is a mil-dot scope and a range finder. Usually you use mildots to estimate range if you know the size of your target. But if you know the range you can get the size of your target.
Here is the equation.
(Range to the target X mils read)/27.77= target size in inches
Now for the word problem.
You see a moose at 217 yards. You aren't sure if he is a legal bull. You measure him with your scope and get 6.4 mils. Now we do some math to find out if he is legal.
(217 X 6.4)/27.77= 50.01"
By the math he is legal but it would be up to you if you want to trust your mil dot skills.
For those of us who don't really understand mildots this is a great website to explain them way better than I can.
Hope this helps.