10-20 hand from today

[Diplomat]

Just got back from a good, long, exhausting session spanning two days where I observed/took part in a few interesting hands. Here's one against fellow poster Gamblor that I think I screwed up on:

Live 10-20 nl. Game is very loose aggressive pre-flop and tricky aggressive post flop. UTG with about 3k behind opens for 50, meaning he was dealt two cards. Thinking LAG with 5k behind calls, tricky thinking player with 3k behind calls, Gamblor calls with about 2800 behind, I call with 44 and about 2700 behind, big blind calls with about 4k behind.

Flop is 46J rainbow. Checked to Gamblor who bets 150. I call, the big blind calls, the pre-flop raiser calls, the 5k stack calls.

The turn is another J and completes the rainbow. Checked to Gamblor who bets 250, I raise to 1250.

Thoughts so far?

-Diplomat