Yeah, I have two 40lb propane tanks in the garage for the grill. In addition, I have 12 small Coleman type propane canisters in the garage. It truly is a nightmare scenario to have to tell the fire department that you have X-number cans of powder and/or 1000's of rounds of cartridges in the house as your house burns. I'm picturing a complete evacuation of the neighborhood and becoming a pariah after such an incident.
Fortunately my house is constructed with concrete block which only leaves a few interior wood framed walls and the trusses on top.