Ok here is the ballistics for a .257 Weatherby
100 gr SP(nosler)
Muzzle 3600 FPS 400 yds 2500 FPS
Tra. @ 100 yds 1.5+ 400 YDS -7.7

Barnes X 115
Muzzle FPS 3400 400 yds 2500
Ft/lbs 2950 400yds 1600
Tra. @ 100yds 1.5+ 400yds 8.1-
Now here is the 25-06 Rem(I love this round)
100gr BLT/Nos
Muzzle 2990 400yds 2350
Ft/lbs
Muzzle 2290 400yds 2350
Tra.
100yds +1.2 400yds 17.0-

115 Nolser(No barnes 3-shok yet)
Muzle
2990 Fps 400yds 2140 fps
Ft/lbs
2280@M 400yds 1274
Tra.
1.5+ @ 100 yds 400yds 19.8-
Now I shoot alot of antelope and deer here in the BIG SKY state and 10 inches of drop @ 400yds is a lot and if I could have a gun the would do that,and not be a weatherby I would have it plated in gold.It would still be cheaper than the ALMIGHTY . 257 Weatherby.
You make the choice,I mean the 25 WSSM lame duck.If I can't have the 257 W. I'll keep my 25-06's.
BBJ