I am trying to use a ballistics calculator that lets me compare recoil of various guns/ammo.[http://www.jbmballistics.com/cgi-bin/jbmrecoil-5.1.cgi]It asks for"charge weight".I have no idea were I would find that. For instance, what would that be for a typical 9mm Lugar 115 gr. and 147 gr.? I assume the 115 gr and 147 gr are the bullet weight. Am I correct? What difference would there be between standard load and +P?