I have no experience with the .358 Winchester. I do own a .35 Whelen and a 9.3x62 which are very similar to the .358 Win. I haven't hunted with my .35 Whelen yet but I have taken some plains game in South Africa with my 9.3x62 and it worked great (handload: 286 gr bullet at 2390 fps).

Personally, I think cartridges such as the .358 Win, .35 Whelen, and 9.3x62 are too often overlooked and underrated by shooters/hunters in North America. I guess the moderate velocities of these cartridges just don't appeal to many hunters/shooters.

BTW, the ol' 9x57 Mauser (.35 caliber) enjoyed a good reputation and the .358 Winchester has almost identical ballistics.

Some articles that you may enjoy:

The Great .358
This heavyweight member of the .308 family hits like a truck and shoots flat enough for most real-world hunting situations.
By Craig Boddington
http://www.gunsandammomag.com/gun_columns/notes/notes0404_0426/

The 9x57 Mauser
http://www.african-hunter.com/9x57_mauser.htm

Cheers!
-Bob F.