Ruger did. Way back. I've seen pictures in books, but never one in the wild."cos I'm somewhat of an autist, I actually got my Mini-14 out to see if there would be any chance of recalibering the receiver for 30-30.
I think it might be possible (but obviously, there's a lot more to it than that), but of course, no way could you do it for 308.
Oops. That's what I get for jumping ahead in the thread.