No, the 6mm Remington is based off of the 57mm Mauser case. I am not even sure .243 would chamber (I hope it wouldn't) you would have some sort of case failure I would think.
It's common for people to use 270 and 30-06 to form 7x57 & 8x57.....the 6mm rem is also a 6x57. I don't know how hard it would be to trim and reform.
Food for thought, the 257 Roberts is also a 6.5x57......
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