i am no expert,but will give you my experience with scopes.i have leupold,swift and tasco scopes.i do not or will ever will own a .22 scope.i have a tasco 3x9x40 on my rem 597 and a fixed power 4x on my marlin 39a .while parallax can be a major problem,most all of mine are set at 50 yards and the problem is at greater distances.i set my 3x9x40 on 6 power,sight it in at 50yds and leave it on that power.it is clear as can be and has no parallax problems.once your focus on the eyepiece is set at 50 yds,you should not have a problem.if you have a scope that the crosshairs seem to move up and down by nodding your head while looking through the scope,set the scope on a power where this stops and focus the eyepiece on that power,sight in and leave it there.i rarely need more than the 6x on mine when hunting squirrels or plinking so it is not a problem .hope these tips help your problem.you should not have a problem with the 4x leupold since it is probably set at 50yds anyway.set up a target at 50yds and adjust your eyepiece and sight in.