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I was reffering to a hypothetical 120gr TTSX 257". Such a bullet doesn't exist, likely because most 25 caliber rifles would not be able to stabilize it. Barnes make a 115gr TSX and recommend a 1:9 twist. A 120gr TTSX would likely require a 1:8 twist in 257", the same bullet in 6.5mm/260 works just fine in a standard 1:9 twist.
comparing a 115gr TSX (best it can do) in 25-06 vs 120gr TTSX in 260 you'll see the 260 pulling way ahead as the distance increases, despite burning less powder and all other good things
I dont do much killin with match bullets like Bergers, so this comparison means a bit more in the real world
25-06 115gr TSX @ 3100 fps
250y zero = -15.5" @ 400y, 2100 fps, 1130 ft lbs, 15" drift
260 120gr TTSX @ 2975 fps
250y zero = -15" @ 400y, 2250 fps, 1350 ft lbs, 11" drift
fits in a short action too