Yes, I have the 18gr .172" chaos bullets, good price, very satisfying WHOP on squirrels. Not excessively picky about velocity, picky about seating depth and jump to lands, these are easily an M.O.A. bullet. You should have a very clean barrel to start, use some HBN in the barrel or on the bullets, that will help if your bore is a bit rough.
I've tried a few bullets, Lehigh Defense are pretty good compared to others.