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I don't beleave I have ever seen a bottle neck paper cartridge. Do you have pic's of one.

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the only bootle neck paper cartridge I aware now is the Model 1866 Chassepot



you have a cylindrical paper case of 13 mm diameter and a conical bullet with 11,8 mm at the base, this two elements are connected by the paper patch. interesting technical solution but it dont stand the test.