SPECIFICATIONS Mk IV 40mm bofors
Date of Design: 1941
Date Placed into Service: 1942
Bore: 40mm/56 Calibre
Overall Weight: 1,150 lbs
Overall length: 98.4 inches
Bore Length: 88.6 inches
Number of Grooves: 16
Length of Rifling:; 75.85 inches
Weight of complete round: 4.75 lbs
Wt. of projectile: HE - 1.985 lbs, AP - 1.960 lbs
Projectile Length: 17.62 inches
Max. Range: 10 degrees-6,844 yards, 20 degrees-9,295 yards, 30 degrees-10,691 yards, 40 degrees-11,208 yards.
Muzzle Velocity: 2,890 feet per second
Ceiling: 22,299 feet
Armor Penetration of AP round: 0 yards-2.7", 2,000 yards-1.2", 4,000 yards-0.60", 6000 yards-0.45".
Rate of Fire: 160 rounds/min per barrel
Ammunition Types: Armor Piercing w/tracer, Anti-Aircraft HE
Magazine: Clip fed, 4 rounds although some guns can use a 48-round clip.
Barrel Life: 9,500 rounds