A customer brought us a 10ga LeFever with a longitudinal crack through the butt. The Crack ran from the butt plate to almost the wrist and was a 1/4 inch wide at the widest point. Turns out if you pack lead shot tightly into a drilled stock the lead will oxidize over the years and expand, possibly breaking the butt stock. I can not remember the amount of shot we removed to make the repair but is was a significant amount.