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Those chamber measurements don't add up to 7.62x39, they look like 7.62x51 or .308. What you might have is a rifle that has been rebarrelled to .308 but with a barrel that was short chambered and whoever did the work never got around to reaming it properly. I think it best to buck that gun to our old friend "a competent gunsmith" for a checkout before doing anything like shooting it. A standard Type 99 Japanese rifle is adequately strong for .308, but so many Japanese rifles have been badly mangled, and there are those cast iron training rifles. So I don't want to give advice based on pictures.
Jim
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