I had never heard of the 9.3X62 in India. Not to say that there aren't any around.

My understanding was that the rifles found in India were mostly of British origin. Until the 1940s this was almost exclusively the case. The Mausers & Mannlichers were imported by the British firms into India. But the common calibers were 256MS, 6.5X54MS, 275 / 7X57, 315 / 8X57, 303, 318 WR, 9.5X57MS, 375H&H and the medium bore doubles of British origin. I have heard of original German Mausers but these were brought in by British officers & Tea Planters. I have also heard of the odd drilling and some American rifles & calibers such as the 405 Win, 32-40 etc. The American calibers become more common after WW2. The Belgian FN also started coming in. My dad had an FN 10.75X68.

Lyon & Lyon in Calcutta may be able to throw some light on this subject.