Pellets from a .177 inch rifle running near the UK legal limit of 16.27 joules (12 ft.lbf) will drop around 11 cm over – more than enough to miss the kill of a target completely – so it becomes necessary to compensate for range by adjusting the elevation of the barrel. Two common methods used are: moving the crosshairs above the center of the target by a lesser or greater degree (hold-over), often using markings on the reticle of the scope for reference, or adjusting a knob (turret) on the scope to drop the crosshairs onto the point of impact for a given range such that the pellet appears to go exactly where you point the gun (windage excepted). Competitors will often carry a small printed table of different ranges with their appropriate drop compensation or calibrate their elevation knob (often using an enlarged knob) – combined with the range-finding ability of the scopes, this allows for very accurate vertical placement of the pellets.