cv540...I have a 77/44 synthetic with a Leupold 1.5x5 on top...2.5" groups off the bench was the norm before putting in an aftermarket trigger....buffalo bore 270gr. loads now do an honest 1.5" at 100yds....and they do clock 1800fps...as advertised....I think it weighs about 6.5lbs all up and is the equal of a 20ga. 3" slug...needless to say I would not part with it....Timney trigger.....regards....bearit....