He mentioned that his Luger had a replacement barrel, so I questioned if it indeed had a stepped chamber. Perhaps I am off base here.
I am loading my 30 luger brass with .312-.313in dia BHN 15 lead, and getting no leading in my 1921 DWM. I am loading these bullets to factory spec velocity according to my old reloading manuals. I am pleased with the results so far. I do wish that I could find some .309in. FMJRN bullets, but no luck so far, only .308in. FMJ.
The .308in FMJ work fine in my rebarreled (to 30 Luger) BHP and Colt Defender. They have BarSto barrels and have tight bores and chambers.....super accurate. They don't like my oversize lead loads, as I expected.
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