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RAE - All good info except the part about the Speer/RCBS connection. It is well known that they have had a commercial connection for a long time. The problem is using Speer bullets in Lee Factory Crimp dies. Apparently the Speer jacket is a little thinner or perhaps a little softer than some others. There were problems with jackets splittng or even separating. Since it is up to the user to set the mount of crimp, this may or may not happen with each user. Speer only put out that warning for Lee dies, not Hornady, Redding, etc. Like you, I have used thousands of Speer bullets with Lee dies, including the factory crimp, with no problems. But the next guy might really crank down on the factory crimp and cause a serious problem.
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