If the decision were mine, I would have no problem. I would build a 358 Winchester. It would appear to be a good addition to the stable of rifles you already own. I am fortunate to have rifles from 223 to 45-70's including a 9.3x62 Mauser, 300 Win Mag, 6.5 CM, 7mm-08 and several others. My current Ruger M77 Hawkeye in 358 Win is my favorite all around rifle (caliber). I like it so much that I am actually looking at another 358 Win in a Browning lever action. Your SA would be a perfect action to build a 358 Win.