Sorry for not having gotten back to you... somehow missed the post!
Well, the .358 Winchester is a great cast bullet gun, especially in the M77 Ruger. The throat is such that bullets over the 215 grain threshold won't work the best due to the bullet necessarily having to be seated deeper than the bottom of the case neck in order to chamber properly.
However, you did ask about the 200 and 215 grain bullets specifically, and they are the ones you want for your .358 Winchester.
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