I'm sure that 250bar is OK and within the tubes tolerances. I've never filled my Ranchero from a Dive Tank, but would imagine that it is very hard to get it spot onto 220 bar (which is such an odd specific number anyway and hard to get accurately via the fill gauge). So I would imagine that FX have chosen that pressure with a degree of overfill in mind. If they had stayed that 250 bar Was OK, then most people would be filling it past 250 and maybe that's pushing it too much. Even with a Hills pump, something in my psyche never fills it to below 220 anyway.
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