I've got an HW35 in .177 sat here doing nothing at the moment. Is it worth applying for a FAC rated air rifle, then having it converted? I don't know much about this subject, but assume that it won't be able to reach the ft/lbs of a pre-charged rifle? Also, is a .177 pellet travelling at FAC velocities going to impart enough energy? It will be used mainly for rabbits.