Munfrosch,
It is very important to measure the projectile diameter #4 at the widest part of the projectile. Your sketch shows the diameter at the bottom of the boat-tail. Make sure you measure at the largest diameter, usually near the rotating band or right where the ogive stops (bourellet) Your projectiles photos 1 and 3 appear to be 77mm German by the double crimping grooves below the rotating band.
Hi
1 : 77mm FK 96 WW1
2 : ?? 75mm for french guns (naval ammo)
3 : 77mm FK 96 WW1
4 : ??
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