Mike it is a Franz Sodia –Ferlach 20 X 20 X 5.6X35R 2.5 g MC made 341. The 20 bore chambers are listed as 70 mm.
Yes, I received the article in the latest WAIDMANNSHEIL that addresses the .22 Vierling. You did a nice job writing a very informative article!
Some .22 Hornet cases will fit when the action is closed and others will not let the action close. I found a box of RWS .22 Vierling ammo 5.6X35R (Sinoxid)2.55 g / 0.43 g RVP made in West Germany (copper jacketed bullet with an exposed lead flat tip like the photo on page 16 of your article except the photo seems to show a bullet with a silver jacket and exposed flat tip of lead. There appears to be a black primer sealant on my ammo. I found it difficult to test for accuracy at 50 yds due to the very thick cross hairs. A scope change is needed and I need to measure the bore and the chamber.
Any suggestions are very welcomed. Thanks to all who responded.
Jim McKee

Last edited by ohiochuck; 11/26/15 10:02 PM.