As I said, I often 3-bet jacks heads up, but in this situation, with one raiser, a caller, two limpers who still have a word to say, and this being 2NL, I am saying that I don't think that it is totally stupid to just call and play for set or overpair value, and even with one overcard you still have showdown value. So I would not call it pure set hunting, like with, say, 55.