Just returned from a black bear hunt in BC. Played with the killo 2400 every day. Seemed to constantly read 1400+ yards in clear cuts. Many times it didn't read further because tithe terrain was such that past the edge of the clear cut the distance was way to far to pick up a reading. Their were many time I got good reading on bushes trees and roads 2200 to 2400 yards. Tested the range finder for accuracy with my weapon a couple of times before I left at varying yardage out to 800. Wind age and drop calls were very accurate. Haven't tried further yet. Planing to use the drop calcution feature on real time field data out to 1600 yards in the next couple of weeks.