My brother and I just went prairie dog shooting for the first time. We went in far eastern Colorado on fields provided by Rebel Ridge Outfitters in Syracuse, KS. We had a terrific time and learned much about something we had only previously read about in magazines. We quickly learned the limitations of our firearms and optics. One area where I was very disappointed was in the performance of my Nikon Hunter 550 rangefinder. I couldn't get hits on anything on the prairie and there was little except a few patches of white weeds to use for a ranging target. I couldn't get a range on a prairie dog at even 100 yards. Are my expectations for laser rangefinders too high? What can I use to range these varmits against the prairie background?