Join Date: Dec 2014
Posts: 13,256
If you started the hand with 16bb, the best size for 3-bet would generally be all in. I don't think it's wise to have a 3b/folding range with that stacksize, (you'd usually have more than a third of your stack in the middle) so anything you 3-bet is either going all in immediately, or snap-calling a 4-bet jam.
When you're deeper, it's much more complicated, because villain can make 4-bets that are not all in, and he can also call your 3-bets.