Ray ,
If everybody seems hesitant to field this question,it is with good reason. Whoever responds will have the flesh ripped from his bones by all the optical experts out there,but the fact that you are buying a boosted t-36 tells me you need help, so I'm gonna throw you a long rope and see if you can save yourself.
Shooting benchrest is kind of a connection with your environment.You see and feel the wind blow through your wind flags and grass ,trees etc. You find a condition that your gun and yourself can shoot well in . You capitalize on that condition and fire five shots downrange for group.The ability to aim quickly and solidly while watching the flags with your off eye is paramount to your sucess.
Does a 55 or higher magnification scope make that task any easier? Personally I don't think so. a clear 36x that is mechanically sound is sufficient. I prefer the 40xs,other guys like 45xs .The ability to judge conditions and aim quickly is more important than trying to aim at the seventh paper filament on the left edge of the mothball.
joel