Do you have any idea why they're focusing on tiny calibers? "Sure, you can shoot someone, but don't really shoot 'em."
It is a stupid idea to limit the effectiveness of civilian owned arms. Much of the law in India was written by technically illiterate socialists. It is derived from British law designed to disarm the Indian public after the 1857 Mutiny/uprising.
As an example, because the 7.65x25 Mauser cartridge is a smaller caliber than .32, if you have a grandfathered broomhandle Mauser or a Tokarev chambered in those calibers, it is legal under the law.
In the USA we have a similar law saying you cannot own a rifle of greater than .50 caliber (passed in 1968) unless a specific exemption is made for it.