Originally Posted by verminator
The point of hanging the moderator on there is to show how a relatively small change in weight can have a significant change in the point of impact.
When the barrel is horizontal, the full force of gravity is acting upon it, pulling it down. When the barrel is tilted to full vertical, gravity is no longer bending it downwards and therefore pointing higher than expected.
Regarding the actual weights, the moderator weighs 165g and the barrel weighs 256g. So gravity is bending the barrel with or without moderator.
So that's why when the wind blows it's not the pellet that's moving, it's the barrel bending in the wind, wish I had thought of this.