Most rangefinders will range deer or pronghorns out to about 1/2 of their rating and elk or moose a little farther.My leica reliably ranges deer out to over 500 yards and elk out to 700 yards or so even under poor conditions(fog,rain or snow).I got rid of my bushnell 800 because it would only range pronghorns out to just about 300 yards on a rainy day last fall.Under perfect conditions all of my rangefinders easily ranged highly reflective objects out to their rated distances.