Really all that is needed is to break the sharp edge of the chamber. I have used wadcutters in speedloaders a lot of years in PPC in a stock 27 and had no trouble. However, if you want maximum speed like Jerry M can do by just throwing them toward the chamber, a little more might be called for. I just would prefer positive extraction to speed of loading. It is pretty easy to get an empty under the extractor, and this takes a little time to clear.
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