Cartridge ID

[Klemm]

Can someone tell me what cartridge I have in the picture below.
factory round.
Steel case(magnet sticks) Case length is 1.556
Bullet diameter .221
Case head .391
OAL 2.237
Is in between size wise 221 fireball and 222 Remington

 

[Halfnutz]

5.45x39 Russian, best guess.

 

[Klemm]

Thanks