The 165 30 cal SST is a bomb at 3000 fps.
The 123 SST is just right out of my Grendel at 2450 fps.
Never shot either of the bullets the OP asks about, but would bet that either could be shot hard enough to make them blow up out of a 243. Just my guess
Actually in my limited experience with the 95 SST in the 243 they're a stout little bullet.
Same for the 85 grain Sierra BTHP Gameking. This one is definitely too hard for my liking. Stouter than either of the 100 grain soft point offerings from Sierra. On a handful of deer I had runners and on 1 coyote he covered about 200 yards with an exit hole about the size of a 50 cent piece. Lung shot, no heart or shoulders hit.
The Sierra gets a lot of praise but it is too stout of a bullet for my liking. Won't knock those who like it, just not what I want in a deer and coyote bullet.
