Or bullets seated too deep or are too heavy or incorrect powder or barrel obstruction or poor cylinder timing or any of many situations. Apparently the information stream did include the info that they were reloads.
And if a liittle BullsEye is good, more BullsEye is better.
Hatcher relates a story about a shotgun reloader who used E.C. blank powder.* After the gun exploded, he attempted to walk away casually, as if nothing had happened, until someone pointed out the chunk of shotgun which was buried in a shooting bench after glancing off a wall. (Notebook, pp 184-187.).
Terry, 230RN
* Blank powder is a very fast powder, designed to propel a projectile weighing zero ( Ø, null, nada, nothing ) grains or ounces.