oneeyedjohn:
a 5 iron dinged comes up 15 yards short of its normal 195 yards.
There is no 'normal' club distance. The club distance WGT quotes is approximate.
Several factors affect how far a shot actually goes. Some of those factors are environmental, like wind, elevation, and the course being played.
Several factors are software driven, like VEM, the attributes of whichever ball the player uses, the ball spin dot setting, club precision and forgiveness relative to where on the swing meter the player 'hits' the ball.
VEM alone will cause variations in club shot distance, Even if you Ding! Excellent every shot.