Re: 6.5x284 or 6.5x06?
You could rebarrel the mauser to the 6.5x284 as they have the same boltface. Since the '06 is longer (2.494" vs. 2.170"), the magazine should work well for long bullets in the 6.5x284.
If some is good and more is better, then too much is just right.
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