375 H&H Mag Confusion

Hi, I know the right is a 375 Flanged Nitro Express (2 1/2") confused about the other two.



So the middle is .375 Holland & Holland Magnum. The left ones measurements as follows:

Case length: 72mm/2,85
Bullet: 11.5mm/.452
OAL: 92.5mm/3.62
flange: 13.4mm/0.527

Could this be a fire formed case?

458 Lott blown out 375 case:):):)