I'm not a big Weaver fan, but I must admit that the Grand Slam line of scopes is excellent. My complaint against them is that they have very, very short eye relief - I'm talking 3" at best on some models. What the heck is that? Granted, your 6.5x55 isn't a big kicker so shorter eye relief won't be a problem, but generally speaking, I would buy one and mount i on my hevier kicking guns in a second if they had longer eye relief.
Zachary