Seeing as how a scope could hardly have been mounted and iron sights seem non existent, either the "Whacker" had supernatural powers of sending the bullet exactly where you wanted it to go, or that bore is nearly pristine. I'm betting on the latter. Cerrosafe is your best friend here. If you can figure out what in the hell the "Whacker" is, you can get dies made and load for it, or possibly set the barrel back a turn and re-chamber to something SOMEBODY has at least heard of.
Although looking at it again, I seen setting it back a turn is going to mess with some really nicely done inletting around the chamber area . . . .
Maybe it will turn out the "Whacker" is the stroke of genuis we have all be waiting for. Wait . . . Whacker? . . . . somebody call Ted Nugent!
It's
Wacker!
