The 7x57 is one of the few rounds where it pays to make your own pressure measurements, in order to get more robust performance. The following loads were worked up in my rifle, and are mostly 4-5 KPSI below a safe maximum load, and could go up a grain for a gain of about 60 FPS I think. Your rifle will be different. Use this information for reference and illustration only.
CCI200, 48.5 H4350, 162 Horn BTSP, 3.190", 2732 FPS, 54KPSI
CCI200, 51.0 RL19, 162 Horn BTSP, 3.190", 2762FPS, 56.1KPSI
CCI200, 50.5 H4350, 150 NosBT, 3.230", 2864 FPS, 56.6KPSI
CCI200, 49.0 RL22, 160 Nos AccB, 3.290", 2650 FPS, 45KPSI
CCI200, 52.5 RL22, 160 Nos AccB, 3.290", 2736 FPS, 55.5KPSI
CCI200, 48.3 H4350, 139 Horn Interlk, 3.018", 2800 FPS, mild recoil