I have this model and am very happy as a beginner hitting where I want at 300 yards. I am getting into reloading and want to venture farther and push my rig out to 600 yards. I have heard this model of scope is not good out past 300 yards because of they way it has its permanent parralax adjustment set at 100 yards. I want to cut throught the bs is this scope good to 600 yards?