Trying to pokerstove this situation and I'm having trouble coming up with a good range for the other guy. He's 23/15 over a decent sample size and he multitables. I started off the session fairly tight, but I've picked it up a bit recently. I haven't come after this guy specifically yet though. I feel like he's been calling me preflop a lot, although I might easily be imagining that.
Party Poker
No Limit Holdem Ring game
Blinds: $3/$6
6 players
Converter
Stack sizes:
UTG: $621.35
UTG+1: $580.60
Hero: $591
Button: $569.65
SB: $719.25
BB: $104
Pre-flop: (
6 players) Hero is CO
UTG folds, UTG+1 calls,
Hero raises to $30, Button calls,
2 folds, UTG+1 calls.
Flop: 6

A

8

(
$99, 3 players)
UTG+1 checks,
Hero bets $75, Button calls, UTG+1 folds.
Turn: 7

(
$249, 2 players)
Hero checks,
Button bets $180
The range I've been using is 1/2 of the AQ, 2/3 the AJ, a single instance of 66, and 79s, 75s, JhTh.