When the SST first came out it had a pretty thin jacket that caused severe fragmentation. Since then Hornady has improved it and added some thickness to the jacket. At 100-200 yard ranges with a polymer tipped bullet you have to expect to lose weight retention as that wedge is drove back into the lead core. They work fine like most bullets properly placed.
Core-Lokt's are a pretty stable bullet but I have personally seen them shed the lead core. With most bullets high velocity and close ranges bullets will open up more than expected. I've also seen core lokt's pass through animals at close ranges too. And as we all know if the bullet is passing through an animal it's not fragmenting too much.
I like the Core Lokt it has preformed well in my opinion in most cases. I also like the SST for a higher BC. Choose an Accubond and get the best of both worlds. I'll stick with my Speer's.