I decide to get aggressive (probably too aggressive tbh) out of the SB and 3bet 76s. I flop a GSSD on a two-tone flop and decide to cbet. 3rd heart comes on the turn and I barrel again, representing a made flush. Turn bricks out. Is this a good spot for a third barrel jam?

Yatahay Network - $0.05 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

CO: 153 BB
BTN: 136.2 BB
Hero (SB): 100 BB
BB: 101 BB
UTG: 97.4 BB
MP: 82.6 BB

Hero posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 7 6

fold, fold, fold, BTN raises to 2.2 BB, Hero raises to 6.6 BB, fold, BTN calls 4.4 BB

Flop: (14.2 BB, 2 players) 8 K 4
Hero bets 8.2 BB, BTN calls 8.2 BB

Turn: (30.6 BB, 2 players) 6
Hero bets 15.2 BB, BTN calls 15.2 BB

River: (61 BB, 2 players) 8
[color=red]Hero ??

3b is too small. When you 3b oop you should use something like 4x more or less.
Turn is not ideal for you. Ip hits some flushes maybe sets and two pairs. I would check this combo you have SDV and some additional equity. If you bets and he jams it's tricky spot.
Riv-is whatever. I would give up we block some folds and non of strong hands and 8 is better for him.

Yeah make it ~11bb's from the sb pre. I give up on the river with sd value on this board.

Not sure why people think we have showdown value.

Getting villain off top pair or a flush is optimistic on the river. Combos with Ah would be a better bluff candidate I think.

I agree that preflop 3bet should be larger - around 9bbs.

Flop cbet is fine.

Turn is not a great card for your range - it completes flushes, straights, 2 pairs, or adds a pair to a straight draw. These hands are mostly in your opponent's range, not yours. "Representing the flush" is not a good reason to double barrel - there are v.few flushes in your range and you wouldn't bet most of your range in this spot.

Three good reasons not to bet: 1) your range advantage from the flop is significantly reduced by the turn card, therefore you and your opponent's ranges are much closer; 2) if you get raised then that's a terrible result as you probably have to fold and that's a waste of your very decent equity, 3) your opponent is never folding a K, any other premium made hand, or a strong draw.

Sounds a bit weak, but I would check and hope it gets checked back for a free look at the river