Matthew,
This is a problem that we run into quite frequently with vintage barrels. Steel based shells expand very differently than the old brass based shells. The thin steel flattens and expands to conform with the chamber. In addition many early chambers tend to be slightly undersized and short rimmed. Our fix for the problem is to fully recut the chambers and rims, polish to a mirror finish and the problem is cured, It works every time.
Brad
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