Marc,
This wouldn't be one of the Gruendig calibers, they came a little later . I wrote an article in "WAIDMANNSHEIL"(one of the German Gun Collectors Assn. publications)on loading generic 11mm cartridges. Except for bullet diameters, the 10x46R and 10x42R should fit into this catagory.I usually load all my own centerfire ammo,even for hunting. I have a couple different calibers that I will start using more factory ammo in,because I have a good amount of it on hand, but this is unusual for me.Handloading just expands the hobby and it is very satisfying to be selfsufficient and be able to shoot rifles I couldn't otherwise shoot.
Mike