155 mm HE ER-BT (OFd MKM) modernized
High Explosive Extended Range projectile with (Boat Tail) is filled with TNT or TNT/RDX (Composition B) explosive in ratio approx. 50/50. The projectile has boat tail screwed on the projectile (shell body) bottom.
Ensures extended range up to 30,000 meters, when fired from 45 caliber gun and up to 31,000 meters when fired from 52 caliber gun.