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Union Soviet Socialist Republics
25mm Gun M40 AA

Showing the details of the shells used(where known)
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Weapon Details
Flag
25mm Gun M40 AA Blank
Calibre25mm
 
UBR-132
(AP Armor Piercing)
25mm 0.3Kg 900M/Sec
Quoted Penetration 35mm @ 100mtr/30° ( ≈ 40mm/0°)
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.24 0.53 1.31 2.57 4.95
Penetration(mm@30°) 32 26 21 14 9 5
Penetration(mm@0°) 37 31 25 17 11 6
Hit Probability(%) 98 98 98 90 44 8



UOZR-132
(HE High Explosive)
25mm 0.3Kg 910M/Sec 0.013Kg explosive
Range(Mtr)10002000300040005000600070008000
Flight Time(Secs) 1.84
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.11 0.24 0.52 1.3 2.55 4.9 11.11
Hit Probability(%) 98 98 98 93 44 8 0 0
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill0 mtr Burst radius Infantry in open 66% kill0 mtr
Burst radius Infantry in open 33% kill1 mtr  Armour Penetration inc roof at 1 mtr0 mm
An explosion within 0 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 1 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 not cause any significant armour damage.

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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