I'll touch on the pre rifled bore diameter but Ford can elaborate. It is the same as 16 lead spheres per pound.

Axel's contribution
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=213433#Post213433First, I thought we might see an M for Metzner or an AM for Albin Metzner but I don't see it. I don't think the Metzner fella expired but he and Robert Schlegelmilch just split the sheet. I've seen listings for an Albin Metzner and also for Georg & Max Metzner. Some sources suggest it was the same person Albin Georg Max Metzner?? I have an inkling that he/they may have been an employee or sub for Sauer???
Kind Regards,
Raimey
rse