The Lee Loading Manual has 308 Winchester case capacity at 3.43 cc, and they list the starting load at 42.0 gr of IMR 4064 as 3.20 cc. I believe that 46.0 grains of IMR 4064 is full capacity of 3.43 cc.
Lee also shows the max for 165 gr jacket with IMR 4064 as being 46.3 gr, and that is a compressed load. So 44 gr is probably only 0.10 cc short of a compressed load. Lee also has 2.750" as the Min OAL, so be very careful of the seating with that load.