Hi There,
Wolfe publishing has a boot called Big Bore Rifles and Cartidges and there is an article on just this in it.
Over on Gunboards in the Swedish Civilain rifle forums is a post with collective handloading data for the 9.3x57mm in both the M46 and 146 Husqvarna rifles. Now I don't normally send folks to other forums and sites but this one ahs the info your looking for.
One thing to watch with the 9.3x57mm is that the chambers do vary is size to care is needed. I tried using the data from the Wolfe book article and found that I had it increase the powder charge quite a bit over that listed to get case obturation. Due to this I will not list any of my data as it might not be safe in your rifle even though mine is built on the M96 action and not a M98.