I almost exclusively use chisel 3/8" and buck skidded oak, beech, hornbeam - both dead-dry and fresh-green.
I also occasionally cut cherry, acacia/locust, Willow and whatnot.
The hardest I ever cut is dead dry Cornelian cherry, followed by 8 years seasoned acacia/locust.
I have been using chisel tooth chains since I bought my Dolmar PS-6400 back in 2006., till then I only used round tooth 3/8" Low Profile on my little 40cc Sachs-Dolmar 105.
Truth be told, I learned how to sharpen a chain half way decent once I started using chisel and the reason is simple - if it ain't sharp it ain't gonna cut!
I am still learning!
I never managed to get equal left and right cutters, within a couple touch ups with a file my chain would start cutting sideways - to fix this issue I would break out the bar mounted file guide to even all cutters.
Only recently I started to flip my saw upside down in order to sharpen the right side cutters and it suits me nicely being a lefty.
Last year I wore out a TriLink chisel loop without ever having had it cut sideways, lest having had used the file guide on it - seems fine to me.
I have two semi chisel loops in usage right now, one is a carbide tipped Stihl Rapid Duro3 so it doesn't really count, but the other is a regular loop by TriLink which gets sharpened freehand with a round file.
Compared to the TriLink chisel loop I wore out last year, the semi chisel loop does not seem to be less prone to dulling but cuts slower, less aggressive no matter how much time I invest in sharpening it.
I use Stihl files, 5.5mm & 4.8mm for my 3/8" loops - they hold a nice edge for a good while.
I also have a generic supermarket grinder which is just collecting dust as I never liked the grinded loops.
They'd cut ok, but reverting the round ground teeth to round filed teeth was a lengthy, tiresome and annoying process - thus I simply stopped using the grinder altogether!
For what it's worth, different chain brands can also make sharpening easier, or more frustrating.
I generally only tended to use Dolmar branded Oregon loops and as such got used to them.
Then I bought some TriLink loops and couldn't get them to cut worth poop!
The difference, the TriLink loop top plates have a 5 or 10° up angle to which my muscles memory wasn't used to.
Also interesting, the Dolmar 099/Oregon 73 loops do not hold up well in dirty skidded logs, a few bucking cuts can render them dull.
The TriLink that I have on the other hand has proven itself ignorant to logs embedded in 1/2" of dry mud - just keeps on chugging, no kidding.
Although, in clean wood I'd rather utilize a well sharpened self feeding Dolmar/Oregon loop considering that the TriLink loop (I have) don't seem to self feed at all without heavy alterations.
From my point of view sharpening takes time, I seem to require about 15 minutes for a touch up, and at least half an hour for a real sharpening - free hand, 72DL loop.
It takes me about an hour to sharpen a 72DL loop with the bar mounted file guide - mostly because it is a clumsy system.
Can I sharpen a chain?
I can make a chain work for me, instead me working for the chain!
What do I consider to be a sharp chain?
A chain is sharp when it self feeds willingly, without the need of aggressively set rakers!
Do I intentionally set aggressive rakers?
Yes I do, but only for loops intended for my Dolmar PS-7900 - a 20" B&C setup simply isn't enough load for this saw, she's screaming for more bite while running a by-the-books loop!
What are other people reactions to "my" chains and sharpening method?
I've been told on numerous occasions that I have no clue - I used to take it personally the first couple times, but then I realized that their opinions don't matter as long as it works for me, each to his own!
Is it frustrating when a loop doesn't perform as expected after one spent a fair amount of time sharpening it?
Yes it is, but what's one gonna do about it except repeat sharpening till the chain cuts well - this will eventually ad to the learning curve and provide muscle memory!
Thank You for reading!
P.S.:
I've never had a loop sharpened by a shop.
I like to have ONE work chain per saw, if it is dull I'll grab the other saw or sharpen the chain.
I'm just a homeowner firewood hack.
I'm no pro at anything, I just make things work for me.