my cutter is only 5/16 x 5/16 th's..I tried the same point as you have showing in your pic..but still got tear out.....and I move like a snail using my dupy...the half round has worked the best for me so far......also if you take your stock and rough it out round with your chisel first close to what dia. your looking for , then use your dupy to finish, it will keep your cutting head sharper longer.
pitch in the wood will dull even carbide after a bit.
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