$27 Bubble steal or check down to eliminate?

[vers]

Hey, is shoving pre better here than flatting. BTN is not a regular and am not sure why he's limping here (I suspect a biggish hand). BB is not mucking to shove (if he mucks, btn mucks and he's messed). What I want to avoid here is shoving, BB calls and BTN calls with a hand that dominates me (which I think is probable).

PokerStars Tournament, Big Blind is t600 with t50 antes (4 handed) Converter on pregopoker.com

CO (t3125)
Button (t4260)
Hero (t5275)
BB (t840)

Preflop: Hero is in SB with 3[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img]
<font color="gray">CO folds</font>, Button calls t600, Hero calls t300, BB checks

Flop: (t2000) T[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] (3 players)
Hero checks, BB checks, Button checks

Turn: (t2000) 5[img]/images/graemlins/diamond.gif[/img] (3 players)
<font color="red">Hero bets t600</font>, BB calls t190 (All-in), <font color="gray">Button folds</font>