We had a grass fire at our gun club and have to make a full report to the landowner. I was hoping to get some info about what could cause it. A 12" Steel Plate was being shot at 200 yards with an AR15 when the fire started. We shoot them every day, they are permanent at 200 and 300 yards. We don't know yet what ammo was used, but will meet with the shooter soon. My question is can FMJ or similar ammo cause this. My fear is tracers were used. We had 2 fires years ago by tracers and they have not been allowed since. Thanks for any input.