Jason280 is correct. The 123 grain version was designed with the Grendel in mind.
I've used the 123 grain SST quite a bit in Contenders and at muzzle speeds ranging from just over 2500 fps to a tad over 2600 fps. They've killed very well on the hogs I have shot, but they are not exactly predictable in performance. They've fully penetrated and exited on quartering shots on 200+ pound hogs but failed to exit on a 50 pound shoat and an 80 pound sow (broadside shots on both of those).
Most of the time, they'll break up a bit and shed their cores, creating quite a devastating wound channel.
In the photo below, the bullet on the left penetrated the shield and shoulder on entry. Only the jacket was found. The bullet on the right entered through ribs, penetrated the offside shoulder/shield and lodged just under the hide. These two produced identical results in terms of quickly dropping two large boars, but they ended up looking quite differently.