What vette said. FWIW, I have used one on my ML for the last several years for deer season, but all of my shots are within 160-170yds where I hunt.
IMO, 2-7x feels OK on a 3-4" target out to 150-200yds, but as I get closer to 300yds I have a harder time feeling comfortable with placement on live targets (paper is easier since I have a much better feel of the physical dimensions.)