An agricultural baler includes a baler chassis and a stuffer mechanism. The stuffer mechanism includes a fork and a motor. The fork is shiftably supported to move along a loading duct during each of a series of stuffing strokes. The fork is operable in a sweeping position, where the fork extends at least partly into the duct, to provide a full stuffing stroke by loading a charge of crop material from the loading duct into a baling chamber. The fork is shiftable by the motor from the sweeping position to a retracted position, where the fork is moved out of the duct. The fork is shiftable into the retracted position for at least part of a respective stuffing stroke where at least some of the charge of crop material in the loading duct is not loaded into the baling chamber.