Well I cut firewood that comes from yard trees and I find a lot of metal in the wood. Here is an example of a post oak log with a piece of rot iron metal fence embedded in it that came in just the other day. See the saw cut about a foot over from the metal bar? That was a cut I made before I spotted the metal. I just barley touched the metal before I stopped. I was lucky and didn't damage the chain that time. Besides who drives 40 min to do a job and doesn't take extra equipment to make sure you get the job done?