At the heavy end of the spectrum, the .358 Norma Mag can shoot 310grain bullets with a sectional density of .346 for more penetration than is often needed.
Bullets of 225 and 250 grains are "normal" and have a trajectory very similar to a 30-06 with streamlined 180gr bullet, so it is easily a 300m cartridge (and of course packs a lot of energy and makes a good-sized hole when it gets there). It certainly is not limited to being a "short range brush buster".
I sure wouldn't recommend the 358 NM to a non-handloader though. If I didn't handload I'd be using a .338 Win Mag, and in fact the .338 Win mag is why the 358 Norma Mag is not more common.
jpb