Congratulations on a very nice find SBHVA will know better than I, but from your description it sounds like a Model 1651 Special. Not common at all. Pictures would be great when you get the rifle. The .358 Norma Magnum is an excellent cartridge. In my humble opinion, it is one of the best medium bore cartridges ever produced. However, the Husqvarna and Schultz & Larsen rifles were, I believe, the only factory produced rifles chambered for the cartridge. And, the .338 Win Mag pretty much beat it in the popularity competition over here in the USA. Brass isn't cheap, but reloading dies can be had from Hornady for a reasonable price.
Bullet selection is a little on the sparse side for the .35
(9.1mm), but there are enough that you should be able to find one that really suits your rifle.
When you get it, pull the action out of the stock and check for cracks/splits in the webbing of the inletting. The .358 Norma Mag has some robust recoil, but is plenty manageable. Good find - there is a .358 Norma Mag in Wisconsin that keeps calling my name:D