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Ordnance Q.F. 6pdr 7cwt MKIV-V

Showing the details of the shells used(where known)
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Weapon Details
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Ordnance Q.F. 6pdr 7cwt MKIV-V
(Anti Tank Gun)
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photo of Ordnance Q.F. 6pdr 7cwt MKIV-V from Wikipedia
History
The 6pdr Mk II—differed from the pre-production Mk I in having a shorter L/43 barrel, because of shortage of suitable lathes. The subsequent Mk IV was fitted with an L/50 barrel, with muzzle brake.
Manufactured1942 - 1945
Calibre57mm
LengthL/50
 
Shot, AP, Mks 1 to 7
(AP Armor Piercing)
57mm 2.86Kg 853M/Sec
Quoted Penetration 68mm@915m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.24 0.5 1.09 1.78 2.61 3.61 4.86
Penetration(mm@30°) 90 83 74 63 53 44 35 28
Penetration(mm@0°) 105 96 86 73 62 51 41 33
Hit Probability(%) 98 98 98 98 77 41 22 8



Shell, HE, Mk 10T
(HE High Explosive)
57mm 3Kg 820M/Sec ≈0.45Kg explosive
Maximum Range not shown as gun elevation is limited
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.52 1.14 1.85 2.71 3.76 5.06
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.52 1.14 1.85 2.71 3.76 5.06
Hit Probability(%) 98 98 98 96 74 39 22 6
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill3 mtr Burst radius Infantry in open 66% kill6 mtr
Burst radius Infantry in open 33% kill17 mtr  Armour Penetration inc roof at 1 mtr1 mm
An explosion within 3 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 6 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 17 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 penetrate 1 mm of the tank armour including the roof.

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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