Mp1 opens $15, Hero MP2 Ac5c calls, btn & bb both call.
Flop ($60) Kh6c3c
BB X, MP1 X, hero $25, btn raises to $55, fold x2,
Hero 3bet to $190, btn calls.
Turn ($440) Kh6c3cTd
Hero all in $320, btn ?

Btn had about $270 left here, but figured he has some type of flush draw or weak king given his small flop raise. How's my line & sizing? Preflop is this hand ok to call with little over 100bb effective, on a table that doesn't 3 bet very often.