Showing the details of the shells used(where known)   Tweet Weapon Details 57mm ZIS-2 L/73 Manufactured 1943 - unknown Calibre 57mm Length L/73 BR-271SP (AP Armor Piercing) 57mm 3Kg 900M/Sec Quoted Penetration 85mm @ 500mtr/30° ( ? 98mm/0?) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.11 0.23 0.47 0.97 1.52 2.11 2.73 3.4 Penetration(mm@30°) 105 102 95 83 73 63 55 48 Penetration(mm@0°) 122 118 110 97 84 74 65 57 Hit Probability(%) 88 88 88 83 70 49 34 22 APBC (APBC Armor Piercing Ballistic Cap) 57mm 3.14Kg 990M/Sec Quoted Penetration 103mm @ 500mtr/30° ( ? 118mm/0?) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.1 0.21 0.42 0.88 1.37 1.89 2.44 3.03 Penetration(mm@30°) 124 120 113 100 88 78 69 61 Penetration(mm@0°) 143 139 131 116 103 91 81 71 Hit Probability(%) 88 88 88 83 74 61 49 22 BR-271P (APCR Armor Piercing Composite Rigid) 57mm 2.4Kg 1200M/Sec Quoted Penetration 140mm @ 500mtr/30° ( ? 161mm/0?) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.08 0.17 0.35 0.71 1.1 1.52 1.96 2.41 Penetration(mm@30°) 158 154 146 132 120 108 98 88 Penetration(mm@0°) 183 178 170 153 139 125 114 103 Hit Probability(%) 88 88 88 85 79 70 61 49 BR-271K (APHE Armor Piercing High Explosive) 57mm 2.4Kg 990M/Sec Quoted Penetration 76mm @ 500mtr/30° ( ? 87mm/0?) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.1 0.21 0.42 0.88 1.37 1.89 2.44 3.03 Penetration(mm@30°) 108 105 99 87 77 68 60 53 Penetration(mm@0°) 125 122 114 101 90 80 70 62 Hit Probability(%) 88 88 88 83 74 61 49 22

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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