Gunner; thanks for starting this interesting and informative thread.
I do not have extensive experience with high velocity .257s but I did hunt for several years with .25-06. I shot a WT buck at well under 100 yards at a steep angle with the 115 original X bullet.
The bullet was recovered and had lost all of its petals, the metplat measured .41? .42? I would have no concerns with a high velocity 40 + calibre flat nose solid.
I think you would do well with the tip less TTSX (TTTSX?
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Maybe try shooting some into test media at 25 yards and see how they do? Not a 100% reality test but it can give a good idea what to expect.
