More often Bluff is using for stealing the big blind. Far from the MTT start (if we're talking about tournaments) bluff can be more profit, especial, if you are the chipleader at the table.
I usual use 2-3 bluff barrel bets, due to postflop action.
However you should be carefully with this, because of third barrel frequently
make you bet all-in. So if you are not sure your opponent fold, just don't play such way. Just make donk bet at all against CALLING STATION