Marcello
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for Tunguska:
Warhead size missle for Tunguska - from 76mm to 152mm. WH=76mm - in the description it is spoken that in a rocket the special explosive and amazing elements (shrapnel new type) are applied - for couples of it it was possible to reduce considerably weight missle.
source Russian:
http://pvo.guns.ru/tunguska/tunguska_02.htm#2
If it is interesting to you to read all source - I can help to translate it into English.