Hello, first post here. Looking to build a 1000 yard bolt gun on a savage action. I've decided on a Criterion Barrel but am having some trouble deciding on an action. I am having a hard time knowing the difference between the Savage actions. Can anyone give me a quick run down? I'd like to by a "donor" rifle at a pawn shop but need to know what I'm looking for. I'm a left handed shooter so would prefer a lefty action but would also not be concerned with buying a right handed one since they are more readily available. Is a detachable box magazine vs single shot vs internal box better for accuracy? Are the differing magazine systems caliber specific?