Just a quick google for the chamber dimensions of each of them it looks like the 6.5x55 is just slightly bigger in diameter by a few thousandths than the 6.5 Creedmore and the 6.5x47. So it looks to me like you could just run a 6.5x55 chamber reamer into either one.
But I'm not a gun smith and have never run a chamber reamer into any barrel.
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