I was looking at some loading info for Vihta Vuori powders and came accross something interesting.
For the 7.62/39 and 303 Brit they have load data for a 57grain aluminum bullet.
The max load gives 3233 fps for the AK and 3865 fps for the .303
it does give a disclaimer on the .303 load that anything over 3300 fps may lead to severe fouling
going to drop velocity real quick, but its also going to have low recoil.