What factory 308 Win would you buy ? Looking for rig to do alot of practice with, so as not to burn up my magnums. Thought a 308 would be a good cal, as I have alot of large rifle primers, and no small rifle primers. Up in the air as to which brand and model, and neccesary barrel length. Also, some models only come with a 1:12 twist, which I dont know would stabilize the 175gr SMK. Have done a search, but did not come up with to much. Opinions requested.