Well, I used my full skip full chisel chain for about a day. It got ran in the dirt severial times. pretty dull when I changed it. Now this is about the fourth sharpening for this chain. Only way I sharpen it is at work on a saw chain grinder. This time instead of changeing the grider stone to one with a good sqare profile, I used what was on there which was one that was pretty rounded. Boy did i screw up. Chain will cut but not nearly as good. Now i know why you don't use a round file to sharpen this type chain. I am going to resharpen again with proper stone hope I can save it.