When I was at the SAKO plant in 1984 as a guest representing Stoeger Industries field sales staff during the Distributors Conference I asked that exact question, about when was "Bofors steel" dropped from being used. The answer I got at that time by either the World Marketing Director, or the A'sst Director of R&D was that all SAKO's to that date were still using Bofors steel ...just not marked as such any more. At least that's my recollection as a number of us were all sitting in a sauna trying to get warm from the days moose hunt and swilling adult beverages. My memory is pretty fuzzy about the rest of the evening though! LOL 'cause a great time was had by all....all week long. What a great bunch of folks those guys at the plant were.
Ron