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United States' 40 mm Gun Penetration tables

Weapon Type of
Ammunition
Weight
(lb)
Velocity
(ft/sec)
Range ° Thickness (mm) of armor penetrated (range meters)
100 500 1000 1500 2000
40 mm Bofors AP M81A1 4.72 2,870   20   2.05-1.75" 1.65-1.4"    

Sources:

  1. US Army Handbook 1939-1945, George Forty, 1995
20th Century American Military History Crucial Site