Aside from the ethics involved-

In my woods 25yards would be the maximum range simply because of all the trees and limbs - 15yards even better.

When i first started shooting my bow (not hunting but shooting my bow) I was practicing out to 100 yards and was getting 6" groups with field points. I was practicing getting my group tighter when a buddy of mine who had been bowhunting before told me that I'd never get good penetration out that far. He was probably right because i was shooting a really old bow without much poundage. So I started practicing 15-25yards instead and have just stuck to that.