Whats his 3bet range?

Hi Americandane,
Welcome to PokerStrategy.com

I'm not familiar enough with live poker to judge, but if this was online, I would assume something like TT+,AQs+,A5s-A2s,JTs,T9s,98s,87s,AQo+,JTo
Note that some of those are 3Bet/Fold and some are 3Bet/4Bet (or even shove)

Against your BU raise-over-limpers it might be tighter.

Equilab shows your equity thus:

       Equity     Win     Tie
BU     47.43%  47.19%   0.25% { 99 }
SB     52.57%  52.32%   0.25% { TT+, AQs+, A5s-A2s, JTs, T9s, 98s, 87s, AQo+, JTo }

I'm not a hold'em expert either — but I'm curious to see what the experts think...

I would expect villain isn't 3betting to light with only a $150 stack and 3betting for more than 1/3 of his remaining stack.
I expect it's less likely villain would 3bet with suited connectors and weak suited aces when he's committed if you shove.
That makes folding to the 3bet most likely the best move with in mind you are flipping at best or you expect villain could play hands like 99-66 like this as well.

Cheers,
SDK1987

Thank you for the comments.
I folded. I saw it as a shove or fold decision.
I also guessed a tighter range than Vorpal above, although Vorpal is quoting the GTO 3Bet BB defend range on button open (the breadth of that range surprises me). I projected there was <10% chance that limpers would stay in the hand, and I assumed no fold equity with villian. So it looks like I had equity of 35% - 44%.

His 4x'ish raise is exactly right for sb, so again he may know the book and was wider than I surmised.

It seems like a coin flip at that stack size. Subsequent play did not change my impression.

Thanks again.
-Dane