Or a combination of ignorant user( remembering that ignorance can be cured by education) and a really stupid salesperson who failed to ask ,powder for what? Or ,was so uninformed that he thought it was the right powder( scary! ) At the risk of kicking a stone down a rocky slope,perhaps a minimum amount of training in propellents should be given to salespersons in the trade.while I have never been endeared of inlines ,being a traditionalist ,I find them,for the most part safe and well made firearms.The ML's have had more than their share of incidences through the years ,properly loaded and cared for they seem safe ,but every incident I have been aware of involved their use with smokeless powder,when with a black powder substitute or bp the story may have been no story at all.