I am currently going to build a F-class rifle on a Savage target action. The rifle will be a 6BRnorma. This rifle will be used as a varmint hunting rifle and for F-class. What action should I build on, and why? Which Savage target action; a right bolt/left port, or a right bolt/right port? The rifle will be a single shot. I'm looking for maximum stiffness in the action. Is one easier to use than another during a match? Does anyone know weight specs for a F-class rifle, or things it cannot have? I was thinking of putting a threaded muzzle break on, but it could be replaced with the cap during matches. Thanks.