that would be the 120 grain partition! Tough enough to penetrate deep , do massive tissue damage at a wide velocity range . Put it in the vitals of a deer, , pronghorn, black bear or elk at a reasonable range and you’ll have a dead animal! That’s about as good of a general all use bullet you’ll find for a 257 wby. Load it with imr 7828 or h1000, whichever gives you best accuracy and that’s your best for all uses load! I had great results using the 117 Hornady sst on deer! Took one of my better bucks with it plus numerous does! Never had a deer run more than 15-20 yards after the shot. In looking for a better bc I started using the Speer 120 gr btsp. Shot 2 Indiana bucks that weighed over 250 pounds each with that bullet. One at 425 yards and the other at 75 yards. Both drt. You can use Berger’s , accubonds and other designer bullets in the 257 Weatherby but It did everything I wanted it to do with great results with standard hunting bullets!Following. Still looking for that one best for all uses load.