Methods and apparatus prevent breakage of a catalyst particle and evenly fill the catalyst into tubes to an optimum density. A loading tool comprises a plurality of damper members extending from a centerline of the tube in at least one radial direction but in every case, having a diameter smaller than the inner diameter of the tube. For example, in one embodiment the damper members are shaped in a “Z”-like formation with each having a different rotational orientation than the adjacent one above or below it. The Z formations can be horizontally arranged along a central member or can be formed vertically in a unitary fashion from a single, stiffened member. In another embodiment, the dampers are formed into spiral or helical shapes that increase or decrease in diameter along the length of the tube.