KK early in Stars 500k

[AZK]

Still getting used to some tourney strategy, this is how I would have played it in a cash game most likely, not positive though. For the most part when we have 100xBB stacks early on I am playing the tournies like cash games...does anyone do anything different here, and if so why (b/c this is a tourney or just in general), thanks.

10/20 with 2.5k stacks.

3 limpers to MP who makes it 120, I make it 400 with KK, folded to mp who calls.

Flop Q73r

check, check

turn 5,

MP bets somewhere between 3-400, I call

River brick

MP bets 600, I call.