You can make cases from 41 long colt, but the rims must be turned down, requires a Lathe. Starline makes the brass. I do not have a Nambu but have cases since I own a 41 colt revolver. There is an article in a old "Handloaders Diqest" that describes making the cases and has loading data, I believe Bullseye was used. However, I do not recall which edition it is?
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