Don, I'm in New Zealand, land of the legal suppressor.
I had a girlfriend back in the 1980's who had an uncle living in Rhodesia. The uncle (named Durham) was having great difficulty trying to leave the country with his financial assets. I remember this because the girlfriend was upset and her father was making lots of international calls.
Is this where you are?
Sorry, off topic
Just had a look around on the net and yes, I can find a little ammo, over here, for the 6.8spc and brass for the 6mmBR but both are costly, well over double the price of more common calibers. Couldn't find anything for the Grendel although 220 Russian brass is available and can be necked up and 7.62x39 brass can be necked down I believe.
If the Sako won't work, what other action will you try?
If the light mediums like the 6x45, 6.5 Grendel, 6.8spc, 6mmPPC,6mmBR (in fact any of the BR cases up to .30) where readily available and common over here then I may well have chosen one of them before I settled on the 308. Another option was the 7.62x39 with the Ackley treatment but wasn't sure how that would fare with steel cases ammo.