If this has been posted here before, sorry. Use spent 9mm cases to make jacketed 10mm bullets. Here is a link to a longer discussion about it. http://www.ar15.com/forums/t_6_42/3...rass_into__40_SandW_hollow_points.html&page=1 I just may give this a shot, just to see how it works! Wanna kill these ads? We can help!