Those 2A46M2/5 are Russian specifications not Indian..
Now why is something as basic as barrel life only a Russian requirement.
Let's see what a DFI guru has to say;
http://defenceforumindia.com/showthread.php?t=208&p=158911&viewfull=1#post158911
120mm rifled guns are dinosaurs. Even with the 1pc ammuntion the gun it self is derived from the old L11A5 series of guns. Very accurate but limited velocities and short barrel life with modern ammunition. I'll take the T-90M's gun if equipped with the 42M over the Arjun's gun. The Arjun needs the new 120mmL55 from either Germany or South Korea.
Rifling is a disadvantage in modern tanks. modern computers and round designed has removed the need for the gun to be rifled. This means the positive effects of rifling- greater accuracy are cancelled out by its down sides- shorter barrel life, harder to clean negative spin imparted to apfsds rounds etc.
Known to be by you?
On T-90 not T-72..
We have gone through this before and discussing this with you has become more disappointing considering you are in contact active Army personnel.
http://fofanov.armor.kiev.ua/Tanks/
If you don't believe this link either, then I give up.
2A46M has a EFC of 800. Our auto frettage plant has increased life to 1700 EFC as it's critical fatigue life.
Ahh, Self made assumptions again..
Gud for you..
As usual, you still live in a well. Makes it even more disappointing.
http://en.wikipedia.org/wiki/High_explosive_squash_head
HESH shells are not specifically designed to perforate the armour of main battle tanks. HESH shells rely instead on the transmission of the shock wave through the solid steel armour.
http://www.wordiq.com/definition/HESH
eveloped and used only by the British originally as an anti-pillbox munition for spalling concrete, HESH was found to be surprisingly effective against armor as well. HESH was used for some time as a competitor to the more common HEAT round, and is effective against tanks from the 1950s and 1960s such as the T-55 and T-62.
Now I am providing links from a dictionary website to inform that HESH is outdated and obsolete. If you think Spalling is still state of the art, then I have to shoot myself.
So much for "information known only to me" and so much for "self made assumptions."
HESH is obsolete. Rifled is obsolete and is a nightmare for modern tank warfare.