Abstract: Apparatus for pushing a load e.g. a projectile comprises an elongate ribbon which can be extended from a condition where it is coiled on a drum to a substantially straight condition for pushing the load. The ribbon has a generally curved cross section when in its straight condition, and at its front end it has a buffer arranged such that when engaged with the load, the compressive force on the ribbon acts eccentrically so as to deflect the ribbon laterally in a direction towards the center of curvature of the cross section and to bias the ribbon against deflection in the opposite direction.