I have a 12FV in 223. I can get a nice Savage Varmint 308 barrel for $190 including shipping. Is that a good price? I know I need a new bolt head. Will the internal parts from the 223 head fit the 308 head? Will it all go together in my Model 12 action? Just getting into this Savage world and don't want to start getting things unless they will go together.