Last time I was at the range, we had a grass fire.
No one was shooting steel target, or steel core bullets nor anything other than paper targets.
Best we can tell a hot bullets glanced off the berm with just enough energy to make it to the dry grass on the other side, with enough heat energy to start that tinder box.
We knocked it down with shovels and rakes before the fire department arrived, keeping it on the clubs property and out of the neighbors crops.
So, I can tell you from first hand experience that grass fires can ignite from just the heat energy of a conventional bullet.
