I seem to remember an older mate of mine doing something like that. He either bought the tool or made it but he used it to "true up"/ swage/size slightly bigger projectiles to the desired size.
Something tells me it helped sharpen up the lube grooves as well, but don't know if that's a benefit or just cosmetics.
Maybe worth a look as it doesn't sound like you'll be shooting a massive amount of bullets out of it.
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