so much discussion about records and possibilities...
Why long eye relief optics: Fast shooting from your feet on running targets, max effective range: up to maybe 300 m if you're good, real good.
Why get a socom: Fast shooting, drop 'em quick, on the move, lighter and more compact for manuevering in rough terrain, buildings, vehicles, etc...tailored for closer range work, but certainly capable of greater ranges if necessary and/or possible. A red dot and/or a lower magnification scout scope is not only capable, but much more effective. Sure you can put a variable high power scope on a socom, put it in a bench rest, exhale slowly and shoot at 500+ meter targets...go for it...but if that's the objective, why a SOCOM. Ever try and hit a fast running target that instantly darts from the bushes 60 meters away, while your walking with your rifle slung on your shoulder, and your scope was on a magnification of 4X or greater...good luck with hitting a target in maybe a 3 second window...that's where red dots, 2.5X power scout scopes, and ghost peeps really shine IMO.
Who buys a socom for long range snipe shooting? Thus, any discussion beyond an absolute max of 300m for the SOCOM seems misplaced and silly...in reality optics choices should focus on a typical range of 25-200 meters for the SOCOM. I'm not saying that the SOCOM can't perform at long ranges, because it can, but it is not designed for that nor is anyone buying one for that purpose.
IMO...and you know what they say about opinions