An old friend and mentor carried a pre-64 model 70 featherweight in 358 for all of his long elk hunting career. His bullet of choice was the Speer 250 grain Hot Core. He killed more elk over his lifetime than anyone I ever knew and swore by that bullet.
I've used the Nosler 250 grain Partitions from a 35 Whelen on three caribou but have no doubt any of the 250 grain offerings would have done just as well.
The 358 would be right at home with any of the 250 grain Speer, Hornady, Nosler, Hawk or Woodleigh offerings.
I m hopping to make it a long term deal myself. I have shot them all I like them all. Just want to make sure I have the most power on tap I can. The 225 are probably more balance, but the 250 all most gaurantees performance in my mind. Also with my scope I m using its not hard to adjust for the additional 1 moa of drop.
