Texasjack, here comes the link to the Honold Drilling:

http://www.naturabuy.fr/Drilling-Artisanal-Allemand-calibre-9-3x72R-16-65--item-1295252.html

To the Slugs: 2-piper is right with the so called rifled slugs, they are for smooth-bore. I mean you can shoot the Brenneke 16/70 Classic, but I'm not sure if it is the same as in Germany. So I just sent a question to Brenneke here in Germany. Will let you know, what they answer.

To the D.R.P. again, DRP is a Reichspatent (Patent of German Reich) in each case, but I don't know exactly if for the soft solder or for the Merkel "Bock" (means O/U which was invented by Merkel)

Best Regards,
Gunwolf

http://www.hunting-heritage.com