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Showing the details of the shells used(where known)

2.0cm Kwk 38 L/55
History

Improved version of the 2.0cm KwK 30 L/55 used on the Panzer II Ausf J and onward

Manufactured1940 - 1945
Calibre20mm
LengthL/55
Rate of Fire220rpm
 
Name/Id Calibre Weight MVelocity Quoted Penetration
 
2.0cm PzGr 39 20mm 0.12Kg 899M/Sec 23mm@100m/30°
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.56 1.5 3.35 9.14
Penetration(mm@0°) 28 27 23 17 11 5
Hit Probability(%) 98 98 98 88 25 1

2.0cm PzGr 40 20mm 0.115Kg 1060M/Sec 40mm@100m/30°
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.1 0.21 0.47 1.26 2.88 7.67
Penetration(mm@0°) 32 30 27 20 13 6
Hit Probability(%) 98 98 98 93 34 2

2 cm Sprgr. 39 20mm 0.132Kg 995M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.11 0.22 0.5 1.35 3.05 8.12
Penetration(mm@0°) 34 32 29 21 14 7
Hit Probability(%) 98 98 98 90 25 2

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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