Rob,

My .02c,

Pappy is correct 25-06 & .257 WBY similar. WBY gets it going a bit faster. Nosler BT's are very velocity sensitive. Box even lists effective velocity range. They seem to excel at long range and not blow apart. Better choice would be 110 grain Nosler Accubond or the original 117 grain Hornady. Most guns like mine seem to hate 120 Nosler Partition in .257WBY. Have no idea why but the Accubond is a good bullet and group's well. YMMV.