Hello Frank, it seems that if your first couple of rounds feeds ok, that something else must be the problem. Have you tried using different rounds, powder, etc.?
This sounds like an interesting gun, I wouldn't mind seeing some pictures of it.
Welcome to the forum, I moved your topic here under reloading, as Parts Wanted, it might not be seen. Also, by using ALL CAPS, it is considered YELLING to computer people and other members from New York and back East told me they can hear you just fine,
{{that is a joke...}}
What is a Shilen Barrel? Is it a bull barrel?
Ed