Some more info for you:-
If it had an OFV headstamp it was made at the Ordanace factory at Verangoan on American made machines. Since yours is KF it was made at Kirkee, ammunition of Indian origin ( + indian machinery) can be a lottery to say the least!
We (UK MIL) junked all our Indian ammo into the Irish Sea in the late 80's -
A contract buy for training ammuntion (as a result of a lot of UK RG 7.62 / 9mm being used in the 1982 Falkalnds war)
It suffered inconsistant powder charges, if you are worried, try weighing a random batches of rounds before shooting them....
To give you a baseline:-
USA M80 7.62mm ball has a charge weight variation of 6.63grains (or about 80fps per grain of powder difference)
If the rounds are ok for weight then try them, if they still don't perform normaly bin them, as we used to refer to the Indian propellant as being more akin to Curry powder than an explosive!