My brother's house, formerly my grandparents' house, burned to the ground about 10 years ago. He had a cheapie uninsulated safe in his closet which helped charcoal the stocks of all it held. None of the ammunition inside the safe cooked off, however, from what I recall. He had a Remington 700, an SKS, and a couple of Winchester lever actions under the bed, which did not burn through. They were heavily scorched, and the optics on the Remington cooked and popped. The only item I know he recovered and resurrected was a nickled 1911, but Ihaven't seen it since then. I do have a pair of Colt Lord derringers which grossly survived, although the stocks are charcoaled. The wooden case they were in was destroyed.
Regards,
Rabbit.