The round consists of a 230 grain projectile encased in a rectangular block of Nitramine 50 propellant. It offers increased power over the M309 10×24mm Caseless round used by the M41A Pulse Rifle, and also incorporates a selectable fuse setting — a switch on the weapon is used to switch between ammunition fusing modes, and the setting is applied to each round electronically as it is loaded into the chamber. The Super setting is optimized for use against soft targets, detonating on impact, while the Delay setting will allow the round to penetrate armor before exploding within. When used in Smartguns or sentry guns, 10×28mm Caseless rounds are stored on a roll of continuous plastic non-disintegrating link belt in an ammunition drum, which can be reloaded in the field.