I have a mcrees precision T mag short action folding stock. I am going to purchase a surgeon 591 reciever in .308, I also have a gift certificate for a free krieger barrel. I'm thinking about getting a 16" #5 contour barrel and put a SureFire brake on it. I plan on shooting this mainly suppressed. I'll probably be shooting Lapua 220grain subsonic. I am unsure of the optimum rifle twist. Can anyone give me some advice?