I agree with Ian here. I'm not sure what situation you have going here but you shouldn't really need anything stronger than simple old 1/4" double braid - using bigger line just makes it more comfortable to handle. In fact, in terms of strength even that should be overly strong. If you fly your sail all in/all out then there should never be a load on that line greater than what you can put on with a dead pull (no winch, no blocks, etc). If that's not enough to roll the sail up you probably have much bigger issues. If you are sailing reefed, the drum generally offers a mechanical advantage over the rolled sail so that reefing line isn't experiencing the same loads as your sheet.
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