Whats difference between 52 caliber and 45 caliber
To add to what my good friend @Abingdonboy has stated above,the calibre is usually written as L/45 or 52 or whatever it is,which means,if you divide the barrel length with this number,you will get the 'calibre' of the gun,which in this case happens to be of 155 mm.So in other words,if you multiply the bore diameter (calibre) with that number (as in L/39 or 45 or 52 or whatever),you will get the barrel length.
Dhanush is 45 Calibre
This 52 calibre will be Dhanush MK 2
There is a 52 calibre Dhanush prototype sitting on the Defexpo floor!!