Add the BORS on to a MK IV Leupold and it becomes easier than you’d ever know, provided you have good upper body strength, for hoisting 38lbs.
http://www.barrett.net/optics/bors
I do it from the bench with my Barrett/Leupold/BORS, from a bench, or prone, all day long. 75-80% hits.
Awesomeness!