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The SWR of an antenna system is just that.  Doesn't matter if you have just a watt or so, or much more, if the antenna is rated for the power level.  A lot of SWR meters won't handle more than a hundred watts or so, and if your meter needs to be adjusted for full scale each time you change power and then switched to "SWR", you're getting a reading of reflected power, not really SWR.