I wrecked 3 brand new chains in less than 15 minutes. Somebody used concrete to fill a hollow in a tree. I moved about 3' each side of the first cut and still didn't find the end of the concrete. I gave up.... 32" bar on the saw.
It doesn't take much dirt to dull a chain, especially if it's a full chisel chain. I've cut trees after actual sunsest when it's been getting dark out and you'd be suprised how many times you see a spark come off the chain even when you think you are cutting in clean wood. Durn squirrels seem to carry sand up the tree and it gets lodged in the bark.
I've gone to semi-chisel chain because it doesn't dull so fast, and I had the last spool cryogenically treated. That seems to help too.
