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MustangMike

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Narrower kerf is less resistance, all things being equal. It is just a matter of simple physics.

Did you mean 404 7 pin is same diameter as 3/8 8 pin?

404 7 pin is larger than 3/8 7 pin.
 

Wilhelm

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I'd probably stick witha slow chain speed in really hard stuff, but I haven't experimented much with extremely hard woods.
Same here!

I gave higher gearing a try and it is counterproductive bucking Turkey Oak logs.
7 pin 3/8" round ground full chisel.
 

davidwyby

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I'd probably stick witha slow chain speed in really hard stuff, but I haven't experimented much with extremely hard woods.
Yes, .404 stays sharp longer but you're stuck with higher chain speed and load. The best I've found for these logs is 395 and 3120 36''/42" .404. bar longer than log dia so not buried. I have some larger logs yet to work on. I'm guessing 36", maybe down to 32" since it will be buried.
 
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