I used a Leupold VX-5 on my recent hunt. It performed really well, but, truth be told, it wasn't really necessary for that particular situation. Prior to getting the VX-5, I used a Leupold VX-3i on that particular rifle for a couple of years and it would have also worked just fine.
Had a really fun hunt in Wyoming and tagged my first ever pronghorn on a self-guided hunt on public land! I spotted this buck early in the morning over 1,500 yards away and made a long stalk (the last 50 yards flat on my belly) before taking a 230 yard shot.