There are some sizes stamped into the bar, check those numbers are the same if your moving away from stihl chain...amazon have the stihl one for £14 ish
Sounds like a blunt chain. You've probably hit stone/metal/soil. When at college as a teenager we were taught how to sharpen a chain long before how to use the saw.
Not my pic, sharp chain vs badly damaged chain. It should be razor sharp, sharp enough to cut your finger - without the saw being on! Also depth gauges set to right height once sharpened
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