I purchased a 100' roll a 3/8 stihl chisel for my 031, 460 and my dolmar 510 w/16" bar. For me it keeps everything the same. With the dolmar only being 50cc, I keep the rakers at .15 to .20. Anymore then that I would have to hold up the saw.
3/8 all the way. .325 is the odd chain out here. 50cc and above wear 3/8, the 2 little guys wear 3/8 LP. One less set of file and guide to lug around, less different sizes of chain to keep separate once CAD causes the saw fleet to grow, and the fact that there are more cutters per inch of bar length to sharpen on .325.
One exception I might make would be on a saw to mill with, .325 narrow kerf should pull easier and waste less wood. There are some guys in the milling section using it for that reason, but a lot still like the durability of 3/8, so there's debate there.
If your 361 won't pull 3/8, it's time to step up to a Dolmar!
I started out with .325 on an 026 stihl, but got sick of it knocking teeth off the chain. Got it modified to run 3/8, did a little muffler mod to open up the saw and its been awesome ever since. I think it cuts just as fast over a longer period as the heavier chain is more rugged, and needs less attention through a days work. A .325 might be a bit quicker on the first cut, but over time it dulls quicker (in my experience).
I tend to cut up quite a lot of waste wood on the farm with the odd nail in, its hell on a .325 but the 3/8 will chew through em and is good as new with a bit of filing.
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