The drum in a correctly manufactured powder measure is fitted closely enough to the hole in the main casting so that this problem will not happen until many years have passed. I have an old RCBS uniflow, and a similar Redding measure as well as Dillon & two Harrel measures. This isn't a problem with any of them.
Were I you, I would take this up with the maker of the measure: if it is relatively new, there is a fit up problem, if it is old some of the manufacturers will hone the hole in the casting, then fit a slightly oversize drum at minimal, if any, cost to the consumer.
Bob
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