I've used the 60 grain SSS quite a bit - ditto on checking to see if your barrel will stabilize them. I've had mixed results in that regard. Sometimes I've had trouble with them key-holing and tumbling in flight.

As far as terminal performance, I'm not too impressed. I've taken several various small game/varmits with them and I've found that their killing power is not that great. Yes, everything I shot with them died, but varmits shot with some other bullets (Power Points, various CCI loads) tended to die quicker.