Some background, 380 Auto, hand loads 90gr HP running around 950 fps. Shooting into late 90's chevy truck bed, something the wife keeps telling me needs to leave the yard but anyway, all rounds pass through the side and if they don't go through the far side rebound into the bed. Today getting a little backyard range time I grab the bullets in the bed after a couple of mags and they were hot, almost too hot to hold. So to the question, was the lead hot from the powder burn (I'm thinking no) or from the impact energy?. I'm thinking yes. What do you think?