Are you sure the brass is reloadable boxer primed? You might want to pull some bullets and check the flash holes.
I've fired many thousands of rounds of that stuff in military machine guns, and the best thing to be said about it is that it goes "BANG!"
India was never a member of NATO, and their service rifle copies of the FN FAL were never produced under license, so you sorta WONDER where they got the ammunition specifications to produce their 7.62x51 "NATO" ammunition.