Thank you all.
The rifle is a single shot Husqvarna and was sold to me as a .22 Hornet. It was my understanding when I bought it that Husqvarna never chambered the Hornet but did do the Vierling.
I have not done a chamber cast nor slugged the barrel yet but a Hornet case is tight in the chamber and the rim is thicker than the extractor 'gap'. That jives with the case drawings I found.
I am fine with modifying some cases and firing either the .22 Jet bullets or some cast at ~.223" (first choice assuming the throat allows).
So then, with the velocity target of 2000fps, I assume cast bullet data for the Hornet would be about right?
Again, thank you all.
Hoot
PS: Ever notice, there's a lot of Mike's here? (Hoot's given name is also Mike).