The SST is one of the most consistently accurate bullets out of my 7mmRM (139 gr) and 300WSM (150 gr). I've shot several deer out to 450 yards with SSTs with both rifles, and could not be happier with the results. Seems like every deer dropped right where it stood, and the wound channels looked like a mini tornado had gone through them.
That being said, I've also shot two NM oryx with them, and even though I recovered both animals, I was not nearly as satisfied with the SST's performance on the larger animals. Whereas every deer I've shot had a decent exit hole, the oryx only had an entry hole, and I only recovered fragments of either bullet.
Based on my own experience, I'm enthusiastic about the SST on deer and smaller game, and pretty hesitant about them on anything larger.