Hi guys and thanks in advance for your input. I'm shooting a 2.5 to 10 LPS Leupold that does not have a parallax adjustment. its a wonderful scope but does have its limitations past 300 yards. It's my primary predator rig that's called on for double duty on occasion. The gun is an accurized 700 that shoots an honest 3/4 minute to my 250 yard zero with my deer loads. The groups do open up some as I get out to the 500 yard realm and I can only assume in this particular case that parallax is at least a major contributor to the issue. My question to you is "have you ever been able to qualify and/or quantify your medium distance shooting as far as fixed parallax vs. adjustable parallax scopes are concerned ? ". In other words can you share what you have discovered ,in your experience , in your changes in POI with scopes that do and do not have parallax adjustment features in the mid range arena ? Like most scopes this one is set at the factory at 150 yards. Again thanks.