I've been recently going through the Sako Collector's Association (1982-1995 RIP) Newsletters and ran into this tidbit. All pre-'72 Sako's have a Bofors barrel. This information was from the factory when Sako One and Two (aka Mims Reed and Jim Lutes) were there on a visit in the 80's and told such. So, if you have a pre- 72, your barrel is a Bofors, just not stamped as such. Don't know about you, but I can live with that.
If there are any doubting Thomas' out there you'll be able to read it for yourself soon.