I recently purchased a Barr & Stroud rangefinder for super long-range shooting. Out here in the flatland, even a Swarovski will only pick up an antelope or deer a litte over 1100 or 1200 yds if we're lucky. We're wanting to shoot our 338 edges atleast 1300 plus. Anyway, I've figured out how it works but have not been out to really put it to the test yet. I was just wondering if anyone has used one before and what they thought about it. How accurate are they really? Any tips you might have for using one? Thanks for any feedback.