Never seen this ammo before

I thought that was weed for a second.

you never heard this before

It's for TT Tula Tokarev pistol. (7.62×25mm Tokarev - 480m/s)

Tokarev

I thought it was weed in the bullet

7.62x25?

It’s definitely .357 SIG. /s My money would be on 7.62 Tokarev given that it was used by many eastern block countries. But 7.63 Mauser or 7.65 Borchardt is possible. Tried for a bit to ID the head stamp but came up empty.

7,63x25 Mauser 1896

7.62 x 25 mm Bad ass little round CZ52 and sub machine guns

Looks like 7,62 Tokarev...

7.65×25mm Borchardt