If your lead bullets are leading your barrel, they may well be undersize for your bore. Have you slugged your bore to determine the exact bore that your Luger has ? Many/most of the original luger barrels were over the .355in that they were quoted as having. Many were .357-359 in. and if you are loading .355-356in bullets, then you can expect leading, especially with light loads that will not upset/obturate the bullet base.
I load lead in my 30 Luger brass, and try to use .002-.003in over the bore measurements. If you already knew this information, I apologize for repeating it.
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