The longarm would have been #1684 in 1914 with a diameter of 15.6mm in the scattergun tube and a diameter of 8.5mm in the to be rifled tube. For the 1st pass for a 16 bore, 148.15 grains of the black powder Austrian Jagd und Scheibenpulver Nr. 1 was used and a cylindrical 888.88 grain lead slug. Upon passing this the intertwined "EF" was stamped. The 2nd proof a charge of 123.46 grains of powder was behind a 740.74 grain cylindrical lead slug. Upon passing the 2nd test the crowned shield was stamped. The 3rd proof used 98.76 grains of black powder and 592.59 grains of shot. After passing this test the crowned doubled headed Hapsburg eagle with the number 1 on the breastplate was stamped on the longarm. The standard or service load was around 70 grains of black powder behind 462.96 grains of shot. As far as pressures, different methods of measuring were used and there may not have been a target pressure. Under the 1929 rules, a 16 bore was to experience almost 13k psi on the 1st pass. Some give that the rifled tubes were proofed in the same manner of the smooth tubes but I have read that on the 1st proof 2 lead spheres were used on tubes that were to be rifled.
Kind Regards,
Raimey
rse
