These rounds all have nominal 8mm projectiles [measured at the cartridge neck] but, the two in the middle…?
On the left, standard military round measures: 8.18 x 57 mm [19 ? 64, 3-point primer crimp, steel case, steel projectile]
The second from left measures: 7.83 x 53.84 [???, 3-point primer crimp, brass case, steel projectile] appx 43.85 mm from base to beginning of shoulder
The second from right measures: 7.92 x 53.56 [ORBEA 1947, brass case, non-steel projectile] appx 45.06 mm from base to beginning of shoulder
On the right, standard commercial round measures: 8.19 x 56.72 mm [R - P 8m/mMAUS]