I've used the traditional interlock for a long time but have recently switched to the SST and a few bonded bullets. For deer the result is the same.....dead deer and quickly.
Yesterday I shot a 4 X 4 Mulie at about 265 yards with a 117 SST from a .257 Roberts.
One shot and the buck run a 10 yard circle but didn't make the entire circle.
The exit hole in the rib cage was about the size of a half dollar.
I'm not sure one can expect anything better. The SST is an interlock as well! I just think they're a bit more aerodynamic.....they sure shoot well!