I can't see any reason to leave extra room for heads to grow. I bought a bunch of S&B factory loads cheap the same day I got my surplus Swede, and have been running those cases in it ever since. If I were starting with an American gun with .473" bolt face I wanted to rebarrel in 6.5×55, though, I'd do some measuring before deciding on brass, or reamer, or bolt face modification.
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