Another terrible play?

[eastbay]

$50 PP tourney, UTG I'm dealt KK. Blinds 25/50.

I'm the only one who hasn't double up yet, half down. Everyone else has 2000-ish, I've got 1000-ish.

I raise to 300. All fold to BB who calls. Flop comes

7c 4d 2h

Checked to me, I go all-in. Comments? Results to come.