Zoner,:take the time and cruise some you tube vids on milling. Lots of helpful info on it by guys who do it. 20" bar won't let you mill much 24" minimum just because of the way you have to set up the mill on initial cuts. From what I saw on those vids most go for a pro saw 70 cc minimum and 30"+ bar length and a chain made to cut with the grain.
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