I think this is what this is!.
See pic,middle projectile, for comparison with M90 series(M99A1), M99 (?) and M50 series(M56) projectiles.

This one i got as a 'stuffer',in a US Hispano(M21A1) case, the only markings i can find on the damaged driving band are; -7-45-20MM M .
This is shorter and different profile to the standard WW2 vintage M99 practice projectile,being closer to the M50 series projectile of the 1950s-.
My understanding is these projectiles were used with the development of the .60/20mm (20x103mm/M50)T61E1 case type from the original .60cal round in the late 1940s.
Any info appreciated!.
Bob
See pic,middle projectile, for comparison with M90 series(M99A1), M99 (?) and M50 series(M56) projectiles.

This one i got as a 'stuffer',in a US Hispano(M21A1) case, the only markings i can find on the damaged driving band are; -7-45-20MM M .
This is shorter and different profile to the standard WW2 vintage M99 practice projectile,being closer to the M50 series projectile of the 1950s-.
My understanding is these projectiles were used with the development of the .60/20mm (20x103mm/M50)T61E1 case type from the original .60cal round in the late 1940s.
Any info appreciated!.
Bob
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