My mate use to do it all the time for his BRNO 223, pulled 55 FMJ's and reseated 55gn in the exact same case on the downward stroke. Seemed to work judging by the groupings he was getting and the animals he shot.
As MD has alluded to, most 223's will shoot 55's ok, sometimes they prefer flat base, and sometimes they prefer boat tail, just gotta play with a few to find out. Or the 52gn HP.
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