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.
Box on the Nosler BT 115s (25115) says "1800-3200fps." While it may be possible to eek out better than 3200fps at the muzzle, we're not going to see that speed downrange.
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