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kman
12-30-2007, 03:59 PM
im wanting to know if you can rechamber from 243 to 6mm just by running 6mm reamer in to 243 old chamber i wasnt sure if it would clean up without cutting new threads

thanks in advance

Big Al
12-30-2007, 05:02 PM
If you mean a 6mm Remington reamer, the answer is yes.

terry byler
12-30-2007, 06:12 PM
the chamber will be too big unless you set the barrel back some

MColeman
12-30-2007, 06:27 PM
the chamber will be too big unless you set the barrel back some
Terry, you are correct. The shoulder diameter of the .243 is greater than the 6mm and even though the 6mm is longer it's not enough longer to clean up the .243 chamber.

Dennis Sorensen
12-30-2007, 07:32 PM
You can use a 6mm Remington Ackley Improved reamer to clean up a 243 chamber but not the standard 6mm Remington reamer... as previously stated the 243 shoulder is large compared to the 6mm Remington.