Jap 7.7 Ammo...Safe to Shoot?

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Friend of mine has some original military surplus Jap 7.7 ammo. Some are loose rounds, but he also has numerous charger clips of 30 rounds each, which I assume is meant for loading into a machine gun. Ammo looks relatively clean with no corrosion anywhere. I saw no head-stamp on any of the rounds I looked at, so there is no way to identify as to when or where it was made.

I recall reading that the Arisaka receiver was one of, if not the strongest receiver of all war-era military rifles made. I also have heard that MG ammo was usually loaded hotter than that which was intended for rifle use only. That being said;
1) Is any of this ammo safe to shoot?
2) Is the MG ammo safe to shoot in an Arisaka type 99 rifle?

Appreciate any & all comments on this. I can get it for a fraction of what commercial ammo is selling for but if it won't work, then its not such a good deal...

Thanks, --728shooter

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