Redonion-

I shoot and load alot of 358 Win, hence the name. Midway and Graf & Sons have the brass on a regular basis. The .358 bullets can be found there as well. Winchester loads the 200 grainer onlyand usually they
be found at Midway, Cabela's, and the auction sites like, gunbroker.com or auctionarms.com and the like.
The 200 grain rounds are very good but if you load for this cartridge, try 225 grainers. The accuracy is still MOA and the terminal performance makes the 200 look weak. I only hunt with the 225's now and can attest to the severe knockdown power on larger game.
Good luck!