up here we cannot get square chain to easily so we use the round square chain and then square file it, not sure why most guys think it is hard to file , it was pretty easy for me to learn, now this is for cutting in the bush not race chain. for myself square filed chain is the only way to go as long as you arenot cutting on the landing
it is faster , smoother and a big one , in the winter when it is cold out you will break less chains because it doesnot grab like round filed chain does
i can hear the guys now , i donot break any chains but try cutting when it is 45 below and see if you donot break chains.
if a am running oregon i could not carry enough chain at that temp. so in the winter most guys up here run calton
the husky shop has a young lad that in the winter time fixs chain most of the day
now with square filed i donot have that problem