I sincerely doubt it. I knew some of the Ruger folks pretty well for a while when Bill was still there, and they all said the hammer-forged rifle barrels didn't appear until the early 1990s.
Thanks MD, l always thought it was a Ruger vendor barrel, mine was very slim in a lightweight taper in the 22" length with a forend to match. Another guy had one about the same vintage in .280 Remington and his barrel was more of a heavy taper and had quite a thicker forearm to match.
