In my software I just ran a 150 gr Speer FNSP bullet at 2350 for the 30-30, and a 150 gr .311 caliber Speer SSP at 2150 for the 7.62x39. Due to the more streamlined bullet, at 190 yards the 7.62x39 bullets speed had caught up and the trajectorys were within 5 yards. Get an SKS and be happy.