I use the 10x42 ranging Swarovski's and love them. Got them when they first came out and they've worked flawlessly on many hunts. I spin turrets on some guns but have the turrets pre-printed in yards so I don't need to mess with the clicks, apps, programs and math, lol. I've ranged out to 2200 yards with them but would say they are really reliable out to 1200 or so and a little sketchy on what they will range over that.