I've used the 270 Speer a lot. It was the only game in town for a long time here in the USA for the 9,3mm.
I shot it extensively in 9,3X74R and a goodly amount in several 9,3X62s. I drove it at around 2,300 FPS in the various 9,3X74R guns and at 2,400-2,450 in several 9,3X62s. In the 9,3X74R I took a kudu, ghemsbuck, and impala. With the X62 I took one deer with the 270 Speer at 120 yards.
At these velocities the bullet did just fine, and accuracy was excellent. I used 4064 and R-15 and used the same powder drop for both rounds with each respective powder.