Ammunition in a fire poses no safety hazard unless there are large quantities involved. Back in the 1940s General Julian Hatcher conducted many experiments using 45ACP and 12 Ga ammo deliberately cooked off with either a hotplate or a resistance welder. A cardboard box was placed over each round as it was heated; the shrapnel barely penetrated the first layer of paper. This is from “Hatchers Notebook” third edition pp531-540. The bullets flying and ricocheting about looks good in the movies but in real life never happens.
This, I think, is why people scare me- STUPID. I think every 'in case of fire' safety warning I've seen involving ammo says to basically STAY THE HELL AWAY because the shrapnel is potentially lethal. Some have said up to 1.5 miles. Who else sees a Darwin Award in this guys future? Hopefully his wife/children won't be around when it happens.