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If the necks are .200 or less ID, they'll be fine. I imagine the seller suggested neck sizing to fix any dented or out of round necks. It would have to be a bad dent before a FMJ-BT bullet would not start and seat. If you have the occasional one that is, you can use a Lee decapping rod or something similar to poke the case mouth and straighten it enough to start a bullet. Any tapered rod that will fit in the neck will work.
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