A pitch will also go long if you're pitching with the wind, if the ball lands on a down grade, or if the landing spot is higher than your lie and you have accounted for the elevation.
Hitting a Pitch with my 64° wedge, rated for 14 yards, it goes 14 yards with a 100% swing and full backspin, assuming no wind and a flat landing spot that is at the same elevation as my lie.
With no backspin, a 100% swing, and assuming no wind and a flat landing spot that is at the same elevation as my lie..