My answer is.... I dunno.
I just bought something that didn't work.
I was looking to put one on Ruger No.1 with a non factory location/length rail, but not quite scout scope far away.
I have a Steyr Scout that normally has a Leupold scout scope, but it was temporarily off the rifle.
I put the Leupold on the Ruger and it worked well. The Leupold is supposedly 9 inches or something of eye relief. The Burris 2-7 scout scope is supposed to be 9 to something inches (or whatever). Same same, I figured it would work. So I ordered one... and it doesn't work on the Ruger, on any magnification setting. Not enough distance from the eye. So I dunno?
I put the Leupold back on the Ruger and the Burris on the Steyr and I think it's the better setup anyway. Surprised how much I like the Burris on there and can really take advantage of the accuracy potential of the Steyr.
(funny I used to be able to shoot sub MOA... very sub MOA groups with a 2x pistol scope (on pistols or scout mounted rifles) But then I used to be able to shoot sub MOA groups with iron sights as well. Those days are long gone it seems.)
I recommended the Leupold for years, but they just keep sliding to cheaper and cheaper quality from what I see. And I really like the Burris so far. (I think I own one Burris pistol scope , but when I was big into that sort of thing they never blew me away. I tried a few but always sold them, always went back to other things.)