Welcome to TFF!
I am not familiar with the maker of your rifle other than in reading about the maker in a couple books, but it is chambered for the 5.6x35R (5.65x35R) cartridge.
This is the same cartridge dimensionally as the old black powder .22 Winchester Centerfire (.22WCF), but in later years it was loaded with smokeless powder to right around the same pressure levels as the .22Hornet (which was derived from the .22WCF).
It was a popular cartridge for small european combo guns (In particular Vierling...4-barrel...guns), that's why it's also commonly called 5.65x35Vierling. The little .22 barrel was often paired up with a larger medium-bore rifle barrel and a couple of shotgun barrels.
There are minor dimension differences between the two, but you should be able to fireform .22Hornet brass to 5.65x35R. The rim diameter of the Hornet is a couple thousands of an inch larger and the shoulder begins in a slightly different spot.
If Hornet brass will fit your rifle's bolt head
, then you should be okay to use them to form your cases.
Here is a link to a dimension drawing of the 5.65x35R through Microsoft Translator. http://www.microsofttranslator.com/b...2FVierling.htm
Original link: http://www.municion.org/22hornet/Vierling.htm
Otherwise, .22WCF brass is sometimes available from Buffalo Arms. It's a seasonal production item so it's not always available. Contact them for availability.
Buffalo Brass isn't cheap, but they've got a lot of oddball cases available.
You can use .22Hornet data for the 5.6x35R.