Art, I can speak on what the 220 (mine) will stabilize with a 14 twist.
Will: 55 gr cup and core type, on up to 63 gr Sierra SMP. Also will happily shoot all smaller bullets I've tried. I don't know about that 70 gr Speer that the Lyman 49th says will stabilize.
Won't: 60 gr Partition. 64 gr Nosler BSB. 65 gr Sierra GK. Darn it. Almost will stabilize the first two, but won't even come close on the 65 grainer.
In the 223, which I use for varmint control (coyotes and smaller), I normally shoot the 40 gr Nosler BT. Amazingly deadly on coyotes and good about fragmenting easily, so no ricochet.