I have a new mathews legacy on order with 28.5 draw and 60 pounds. I am trying to figure out what my arrow speed will be by using the speed calculator at bowjackson.com but I do not know anything about virtual mass, Bow Efficiency, or SE/PDF_Ratio. I need these numbers to use the calculator. My arrow will be about 405 grains and 29 inches. I am going to shoot the carbon express 3d select 300' s. With one nock and a peep and a caliper release. Any help would be appreciated.
Thanks