Just as to my own data, I recently shot several 7mm Wby rounds out of my Wby Ultralight Weight through my ProChrono, and I fell in love again with CorBon:

7MM WBY: Nosler Custom 160gr AB (26� barrel) (mfr: 3050 fps)
2,911 fps
2,936 fps
2,917 fps
2,943 fps
2,930 fps
2,936 fps
2,931 fps
AVG: 2,929 fps
FPE: 3,048 ft-lbs

7MM WBY: Weatherby 160gr AB (26� barrel) (mfr: 3050 fps)
2917 fps
2962 fps
2930 fps
AVG: 2,936 fps
FPE: 3,063 ft-lbs

7MM WBY: Weatherby 140gr TSX (26� barrel) (mfr: 3250 fps)
3079 fps
3137 fps
3167 fps
3182 fps
AVG: 3,141 fps
FPE: 3,067 ft-lbs

7MM WBY � CORBON 160gr TSX (26� barrel) (mfr: 3200 fps)
3,252 fps
3,228 fps
3,244 fps
3,228 fps
AVG: 3,238 fps
FPE: 3,725 ft-lbs

This is consistent with my chrono�s reception of CorBon .340 Wby rounds:

.340 WBY: CorBon 225gr TTSX (26� barrel) (mfr: 3100 fps)
3159 fps
3161 fps
3149 fps
3182 fps

CB is the only ammo I have found that consistently shoots above the specs. The Nosler Ammo in 7mm Wby, .340 Wby, and .375 Wby is however very consistent and accurate.