They are only dropping about 4-5 inches into the container. No different then dropping them from the mold onto a towel or pile of cast boolits. If they do get dings I don’t really notice them, its minute and nothing to loose sleep over. A microscopic ding aint nothing compared to the ding its going to have when it hits the steel backstop.How do you keep it from doing that? I've cast some fairly hard bullets, but even they would have gotten dinged by the drop into a container.
One could catch the bullets with your hand as it’s dropped from the star, but I found this to be too much of a pita.
Tumble lubing is the one that I think would ding up the bullets the worst, but it is still a very popular method for some folks.