The 6 x 47 is formed from the .222 mag. case and they list the case lenth for the 6 x 47 to be the same, which is 1.850. My guess is that when you form your brass it will come out some what shorter than that. The OAL for a .222 mag. round is listed at 2.280. It would depend on which .243 bullet you chose to use what the best optium OAL would be, but you should be able to seat any of them deep enough to get them to feed through your mag. if that`s a big consern. You might give up acouple of fps., probibly under 100 fps. at max. That`s a worst case senerio.
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Catfish
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