MS 660 with a 42in bar?

[BobL]

This guy makes some good points on chains. Most important part of the milling equation.
http://www.sawmillchainsaws.com/sawchains.htm

Id' be taking that info with a few grains of salt.
That web page recommends a fixed raker depth of 35"' .
This will be WAAAY to aggressive when the chain is new, in wide, hardwood.
And it won't be anywhere near aggressive enough when the cutters are worn, especially in narrow, softwoods.
Check out "progressive raker setting" - this sets the raker depts from ~25"' when new to >50"' when the chain is old.

 

[Johnnybar]

This guy makes some good points on chains. Most important part of the milling equation.

http://www.sawmillchainsaws.com/sawchains.htm

There may be good info there but I'll stick with personal experience. Cutter/raker grind has to take available power into account. My 10/50/-10 Archer comp semi-chisel works about as good as one can expect on a 36" mill / 660 rig. Proofs in the puddin':