Heck, that's easy. Keep the 308 and buy the '06! As I am sure you are aware there isn't a big difference between the two, until you get to the heavy bullets.
If one is all you can afford, there is always the re-barrel option on the model 111. All you'd need is a new magazine well and follower (unless yours does not have a spacer for the shorter round) and a new barrel. Plus the tools of course. But if you don't have all that, it might be cheaper to buy the '06.
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