I'm not sure. I just thought it was interesting and might be an option for people. The Sako I looked at was pretty old, mags may not even be available.
I have a Sako model P72 rifle, which is the predecessor of the model 78 that was linked to this thread. rumor has it that the M78 magazines will fit the P72, but I can't verify it because I don't have an M78 yet. anyway I also have a pair of NS522 rifles, and although the appearance of the bottom metal is shaped very similar to the Sako, the dimensions are different. the P72 magazine is almost half the width of the NS522 magazine, and will not align or latch in the 522 magwell. I have no doubt that some other magazine will fit or can be modified to fit easier than the Sako.