Not a physicist, but I would imagine a lead slug stepping along at 3 to 4,000 fps might generate a little heat when it comes to an instant stop. Might even turn into molten lead which is warm enough to ignite a lot of materials.
A little surfing found:
According to research by FLIR (manufacturer of thermal imagers) the surface temperature of a fired bullet is up to 500°F. ... The specific heat of lead is 0.13 J/g , so if all of its energy was converted to heat (by deformation impacting an infinitely hard target) that 200gr = 13g bullet could gain something like 1400°C
Last edited by 1minute; 09/06/20.
