257WHBY13—I checked Sierras bullets and according to them they don't make a 120gr bullet in .25/.257 bullet? Their heaviest is a 117gr. Can you verify the bullet in the load info you posted?
Good morning! Yes they are 120 grain BTHP Gamekings, they discontinued them about 10 years ago, but I had a few boxes. I've killed about 25 Deer with the 257 WHBY and I like Partitions the best, but I live in GA where shots can be from 10 yds to 400. Good Luck!