I spike the turn to 300 and see what happens. This bet looks like you have the set and pushing out his draw. If he comes over the top then you have a new problem..LOL.. Position is the key on this flop and you have it and I would use it on the turn. Even if he has a 10 I doubt he leads out on the river with a big bet. He will lead out small to suck you in or be afraid to lay into you with a big bluff.