Question about 37mm cartridge case USA.

[besons]

Vi esta vaina de cartucho estadounidense de 37 mm, pero supongo que no usaba el proyector que se muestra a la izquierda. Digo esto por las tres marcas de engaste en la vaina, que no corresponden a ninguna ranura del proyecto.

I saw this U.S. 37mm cartridge case, but I assume it didn't use the projectile shown on the left. I say this because of the three crimp marks on the casing, which don't correspond to any groove on the projectile.

 

[stuff]

I think this is the correct projectile, here are three examples I have in my collection. The cases have four neck crimps. Hope this helps.

 

[besons]

Hello. Thank you very much for the information. Regards.