I have also heard stories about Dave. However, his well written and most informative article is "The Amazing 5.6x61vom Hofe" in Rifle Magazine January-February 1971. Just note that he is using Hodgdon H4831 as IMR 4831 did not exist then. His best recorded velocity from 70-grain Barnes bullets was up to 3,798 fps.

The two rifles he tested were a single-shot by Eblen of Stuttgart and also a Christopher Funk of Suhl Mauser sporter. The Eblen was interesting for having 2 sets of extractors, one for the rimmed and one for the rimless case. This rifle has Purdey style twin underbites and twin Kersten top extensions, so presumably it's well engineered for the higher pressures of the rimless ammo.

In terms of Ferlach quality, I can only say that I'm most impressed by this Drilling with it's two engraved chamois. I have owned other Ferlach combinations guns by Franz Sodia, Urbas and Winkler.

I forgot to mention the Hornady .228 bullet. This is unfortunately discontinued, but you might still find some at gun-shows. I was in correspondence with Hornady about the appropriate seating die for the .228" calibre bullet. The person replying also had a 5,6 vom Hofe and had just accounted for a whitetail using their bullet, that he was quite happy with.

The two 2 rimless rifles here are a Walther Roell Mauser-sporter and a Frankonia Mauser sporter, (with a Frankonia scope)!

There is more reloading data here in German for the 5,6x61 SE vH, if that is of help. DEVA Wiederladen Vorbereitung und Praxis. 5.Auflage. (2005). Werner Reb also discusses it in Pirsch 5/99 in Die Patronen des Monats. Dave Wolfe sold his Funk rifle to someone who also tested and published their data on it. I have a copy somewhere.