United States 40mm Automatic Gun M1

Showing the details of the shells used(where known)   Tweet Weapon Details 40mm Automatic Gun M1 (Anti Aircraft) History Designed in 1930 in Sweden the Bofors had two variants the L/60(really L/56) and the L/70 which didn't reach production till 1948, so the data shown is for the L/60 version. America manufactured this gun from 1941 and Chrysler added water cooling. Manufacturer Bofors Manufactured 1933 - present Calibre 40mm Length L/56 40 × 311 mm R (HE High Explosive) 40mm 0.95Kg 850M/Sec ≈0.143Kg explosive Range(Mtr) 1000 2000 3000 4000 5000 6000 7000 8000 Flight Time(Secs) 1.57 4.71 14.18 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.12 0.25 0.52 1.18 2.02 3.14 4.71 7.06 Hit Probability(%) 98 98 98 96 64 25 8 2 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 2 mtr Burst radius Infantry in open 66% kill 5 mtr Burst radius Infantry in open 33% kill 13 mtr  Armour Penetration inc roof at 1 mtr 0 mm An explosion within 2 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 5 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 13 mtr of infantry in the open will cause 33% casualties. The blast effect of this shell exploding within 1 mtr of an armoured vehicle will not cause any significant armour damage. Vehicles in our database using this gun Vehicle Name Common Name   Twin 40 mm Gun Motor Carriage M19

Hit probability is based on a static 2 x 2.4 metre panel at 0 degrees(vertical) at the range specified.

The data that has been used to create these records has come from Wikipedia, The Lone Sentry, The Bundes Archive and numerous books and websites that have provided the detailed information that has not been available anywhere else. The information we use to calculate the penetration tables, flight times and the hit probability comes from the Gun Calibre, the Shell Mass(Kg) and the muzzle velocity, plus range reductions to allow for gravity and wind resistance. This calculation originally came from a pre-war Krupp calculation which has been modified, and seems to fit the actual test results.

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