How does one sharpen Granberg ripping chain?

[Big Beech]

Yes, sharpen both teeth and scoreing cutter. You will go through normal files at an increased rate as the the teeth are harder than normal chain. I us the granberg grinder and stones. Saves my elbows!

[Macpherson]

As far as I remember it's modified Carlton chain and as the teeth are ground to the new profile of the scorers and clearers of ripping chain the metal becomes ' work hardened ' which makes it very hard on ordinary files. I also use the Granberg grinder to sharpen it. The harder the better imo