Unknown (some to an extent) ammo

[MTN-Doozie]

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Got some ammo in a bulk bag of 8mm mauser but some seem off. Also got a lone round just trying to identify firearm, and one on stripper clip, i was told was 7.7 but stripper does not fit in my type 99 and ammo fits in gun but bolt will not ride forward all the way.
The pic of the ammo in the line (from left to right) No name stripper clip ammo, the 7.62 that I have no idea what it goes to, 7.92 for my 8mm mauser, the 1938 nazi stamp, 8mm U.m.c. stamp, one that says FNP 7.92-952, and mosin 7.62 x54r (for size comparison)

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