 Anti-tank ammunition available from World War II until the late 1960s was based on the UBR-412 round, including the BR-412 armour-piercing high-explosive projectile, with the ballistic-capped BR-412B and BR-412D ammunition becoming available in the late 1940s.There was also a D-412 smoke shell.In 1964, the NII-24 research bureau started design work on an improved 3UBM6 anti-tank round.