I've had my sawmill five or six years and have never sawed through a nail until yesterday. My neighbor had brought me a couple of Chinaberry logs after I had asked him to be on the lookout for some. He had cut the 9' x 18" log in two as he hauled it in his pick-up. On the first log, I sawed through a small finishing nail that didn't do much damage to the blade sharpness. On the second log, the last cut, I heard that "zing" and I had gone through two 12d nails. One of them was bent over and I sawed through the length of it. I'll have to put on a new band before sawing again.
I did get 150 bf from the logs so I guess it was worth a $22 band. No pics as it was late afternoon and I was too tired to go get the camera.