> the saws using .325 don't have the required power.
I agree with that 100%. My Husky 365 was only suitable for 16" with a 28 inch bar because it lacked the horsepower to pull the whole length of chain through wood while ripping. That was with the full comp low pro or 3/8 skip. Even if I was willing to wait, I did not want to kill the saw prematurely by loading it down.
A few boards would not hurt, though if you are thinking 1000 bf out of something, I would not bother.
If you want ripping chain in that size for just a few boards, just buy a grinder and grind your own chain.