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Electrolytic capacitors are a strange breed. They work best when operated near their voltage rating but have short lives at higher levels. Today's higher line voltages imply a need for the higher ratings.
Measure the voltage you have and add about 10% and you will probably be good to go.
I don't think using 600 V units will give you any real benefit unless you find the voltage to be dangerously close to 500 V.
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