The XM1028 is also called, the “Room Broom”. I found this information on a Google search.
The genesis of the XM1028 120mm Canister Tank Cartridge also comes from recent developments in Korea – - with the removal of 105mm equipped M-60 and M-1 tanks, USFK has an urgent need to field a 120mm-based antipersonnel projectile to replace the 105mm M494E3 APERS round these tanks fired. In 1999, ARDEC responded with the introduction and testing of the 120mm XM1028 canister round, which fulfills the requirement for a dedicated antipersonnel round used against close-in (up to 500 meters) massed infantry armed with automatic weapons and hand-held anti tank munitions or devices.
Lacking an explosive component, the XM1028 is, in effect, a 120mm shotgun shell. But it’s no ordinary shotgun shell, for sure: a typical OO buckshot round 2