I used to use 760/414 in the 7x57, and it did provide outstanding velocities with good accuracy--in what might be called normal temperature ranges. But eventually I found it didn't work nearly as well in real cold or heat, proving too erratic.
Agreed ...760 has been a heart break for me because while velocities were really good and accuracy excellent, the stuff dumped a lot of velocity in temps around 20 degrees. I stopped using it in the 30/06 and 375H&H so never tried it in the 7x57.I suppose in consistent temps it would work great but I don't have that where I shoot and hunt.
My last 7x57 was a Rem Mountain rifle that stacked bullets and doted on 51 gr RL19 and the 140 Partition for about 2840 or so fps.
