For the +/- 10 cords we cut each year a single pro saw plan works. I go through a bar and maybe 2-3 chains each year on the wondrous MS261 with a now downsized 16" bar from 20" .Why ? Dirt, rounds, barbed wire, dead mammals in the trunks. It has done up to a 36" DBH oak a few times without timely delays. An older 028 and loaned 440 are too much to handle for heavy cutting. BTW: a pro Stihl 009 does the tree climbing, long trail walk ins, and blowdown limbing. It has gotten me out of user jams with the 261 ( truth sets you free ).
It's beyond me other than the testosterone demand why any non pro cutting less than a few cords each year even thinks a 440, 660, 880 will speed anything up. But your choice. Hubris.
Never will use a chisel tooth chain again. Dulls quickly. Harder to sharpen correctly, chatters. Gave me hemhoroids (sp. )