First and foremost, the moisture content of your cannabis is critical to ensuring minimal damage to the flower. Flower that is too dry will fall apart during the bucking process. Subsequently, if the flower has too much moisture then it will compact and dent.
To achieve the greatest results with dry bucking, moisture content should be between 12 and 14% when using a machine. This can be somewhat hard to measure, but there are a few key indicators that any grower or machine user will be able to feel.