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40mm Automatic Gun M1

Showing the details of the shells used(where known)
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Weapon Details
40mm Automatic Gun M1
(Anti Aircraft)
photo of 40mm Automatic Gun M1 from Wikipedia
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.
Manufactured1933 - present
40 × 311 mm R
(HE High Explosive)
40mm 0.95Kg 850M/Sec ≈0.143Kg explosive
Flight Time(Secs) 1.57 4.71 14.18
Direct Fire
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% kill2 mtr Burst radius Infantry in open 66% kill5 mtr
Burst radius Infantry in open 33% kill13 mtr  Armour Penetration inc roof at 1 mtr0 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 NameCommon 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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