Berger's data for the 168 Classic Hunters might not be as readily available online compared to their other bullets. However, you can start with the data for similar weight bullets and adjust accordingly. Since you mentioned Hodgdon only lists Barnes 168gr, you can use that as a reference point but remember to start at the lower end of the powder charge and work your way up while watching for pressure signs.
For more precise data, you might want to contact Berger directly or check if they have any updates on their website or reloading manuals. Using data from similar bullets like the 175EH or 180 Hy-Tgt can give you a rough idea, but always proceed with caution when working with new load data.