Adam Wilder demonstrated how to create realistic projectile impacts during the seminar in September of 2015. He used a Panther turret to create the demonstration sample. Don't miss the video of one of Adam's sessions where he demonstrates creating rust effects.
Using a rubber tip pen (artist shaper), Adam ground in a bit of Wilder Gunpowderline Bright Steel pigment, then used a graphite pencil for a slightly different tone and then finished off with hint of Wilder Gunpowderline Black pigment around the outside perimeter of the damage.