124's are great fun !!!! I am a bit intrigued that the pellets did not go through the cardboard backer after the paintballs.
What were the temps the day you shot those ? I am thinking it was colder than the typical heat I shoot paintballs here in Texas. I know the cold makes them much firmer. I tend to set mine on golf T's inside my pellet trap so my misses are contained. Great Fun !!!
Hairsmith