To answer your question. I cannot think of any useful purpose of these rounds other than possible self defense, assuming they would give adequate penetration then fragment. In that case they could be very destructive to surrounding tissue and internal organs creating massive trauma.
Sorry about all the off the wall posts, it's a problem with all these forums as some feel the need to pop off. You stated that you had never fired these rounds before before so you were not aware of a potential fire hazard. By the way for those that don't know, any firearm is capable of starting a fire under the right conditions. It also appears that the rural area was safe for typical handgun shooting.