Just for the general body of knowledge on these rifles, my load for the 9.5x57 MS;

I load a 235 grain Speer semi round nose, over 53grains of Benchmark. It gets 2300 fps and (with open sights) two inch groups at 100 metres.

It feeds fine. (But you have to keep the OAL over 3.00 and under 3.050 or it starts getting too long for the mag - I settled on 3.030)

Brass is ex .35 Whelen.