I know little about this gun and am liking the learning experience.
BTW, that Scopechief was a very good scope back in the early 1980s. The optics tests showed them to be superior to the VariXII Loopies in many respects. I bought two of the same scopes back then, and I put one on my grandson's 243 recently for his first deer hunt. He nailed a 3X3 mulie at 420 yards. I use the other on a vintage Mdl 70 of mine.
I think brayhaven might be on the right track.