Preflop cap w/ AKo

[fmsr]

Villain is 18/15/1.5 over ~50 hands.

Is this a standard cap? After his 3bet I put CO on AK,QQ+ because of his stats. Do you find a bet anywhere on turn or river?

Cryptologic
Limit Holdem Ring game
Limit: $1/$2
6 players
Converter

Pre-flop: (6 players) Hero is Button with A[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
<font color="red">UTG raises</font>, UTG+1 folds, <font color="red">CO 3-bets</font>, <font color="red">Hero caps</font>, 3 folds, CO calls.

Flop: 9[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] (11.5SB, 2 players)
<font color="red">CO bets</font>, <font color="red">Hero raises</font>, CO calls.

Turn: 9[img]/images/graemlins/heart.gif[/img] (7.75BB, 2 players)
CO checks, Hero checks.

River: 4[img]/images/graemlins/diamond.gif[/img] (7.75BB, 2 players)
CO checks, Hero checks.

Results:
Final pot: 7.75BB