Union Soviet Socialist Republics 57mm ZIS-2 L/73

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 0.48 1.03 1.69 2.47 3.42 4.61 Penetration(mm@30°) 100 92 82 70 58 49 39 31 Penetration(mm@0°) 116 107 95 81 68 57 46 36 Hit Probability(%) 98 98 98 98 81 48 25 8 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 0.43 0.94 1.54 2.25 3.11 4.19 Penetration(mm@30°) 116 106 95 81 68 56 45 36 Penetration(mm@0°) 134 123 110 94 79 65 53 42 Hit Probability(%) 98 98 98 98 85 57 25 15 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) 0.09 0.17 0.36 0.8 1.34 2.02 2.9 4.09 Penetration(mm@30°) 157 143 128 106 87 71 55 41 Penetration(mm@0°) 182 166 148 123 101 82 64 48 Hit Probability(%) 98 98 98 98 90 64 34 15 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 0.43 0.94 1.54 2.25 3.11 4.19 Penetration(mm@30°) 88 81 72 62 51 43 34 27 Penetration(mm@0°) 102 94 84 72 60 50 40 32 Hit Probability(%) 98 98 98 98 85 57 25 15

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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