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Old November 18, 2012, 11:28 PM   #5
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Join Date: February 13, 2006
Location: Washington state
Posts: 12,865
A few issues:
* A 257 Roberts reamer will not clean up the 243 chamber, as already mentioned.

* A .250" bore may not fully clean up the .243" groove diameter of the 243 barrel.

* As already suggested, you would be better off going to a cartridge based on the 308 Win if you are dead set on reboring.

* You may be better off rebarreling, it will cost about as much as reboring and re-rifling, possibly less.
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