I am trying to find out the difference between Australian 9mm Ball Mk1 and Mk2.
Even though Commonwealth SAA was supposed to be identical to that produced in the UK. It is not as simple as comparing these two loads as manufactured in Britain where the Velocity of the Mk1 is about 1200 fps and that of the Mk2 about 1300 fps.
Original documentation from Army Inspection Service, dated 1st March 1944, states that the Australian 9mm Ball Mk1, which was loaded with 6 grains of Ballistite B.16, had a mean corrected velocity of 1310 =/- 30 fps.
Does the Mk2 have a higher velocity, or just a different powder type? Or What?