fire forming with .001 neck tension

Will it work with .001 neck tension? I had trouble with the redding ball and the right amount of lube in the die, so I mandraled after FL'ed. Plan on near max load. I used a .307 mandrel and just measured my Redding ball.... .307. Go figure. Do these Redding expanders need polishing from new ?
Never had a problem with mine but anything that is mass manufactured can have errors.
 
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