Round filed Chisel for speed. Semi-Chisel for dirt. If you see sparks that's dirt. Skip tooth is to run longer bars with less horsepower. Don't bother with full chisel not enough benefit. The steel used for saw chain is so good now it's almost as hard as Swiss Files. I just grind now. Touch, touch, touch, the wheel to the cutter to allow time for the heat to be absorbed back into the cutter and dispersed. Just kiss the rakers. Stihl chain is a 2% better than Windsor or Oregon and not worth double the cost. Check this out: http://www.baileysonline.com Get on their mailing list for their specials. I buy 7 or 10 loops at a time and sharpen them all at once at the same settings. This Oak was cut Monday with Woodland Pro 30RC http://www.baileysonline.com/search....rc&catID=11810 30SC handles dirt better http://www.baileysonline.com/search....rc&catID=11810
Nothing puts a smile on my face like a storm of big fat chips coming out of a log.