Yup, that seems to be the beastie! Caliber should indeed be the 8x57IS. But check it anyway!

I once scrapped a Chinese G98 rifle - the quality was awful! I would not assume that earlier Chinese rifles were better. So if you are thinking of shooting it, go very, very carefully. You can find enough tips on these forums about checking out old service rifles, but if you have no experience with old, dubious rifles, I suggest you meet up with someone who has that experience, and go through it together.

Patrick