Tuning the Benjamin Marauder

 Marauder 22 caliber.The instructions I've seen are too complicated and time consuming for me, Caring for an elderly relative 24/7. Is there way to get to max power quickly? I would like to know settings for max power, no tuning, just 900 fps, shot count irrelevant! Don't care about bell curve shot string. Gun is unregulated, have installed larger transfer port. 10 max power shots would be acceptable to me.