Fold. You are not getting close to the odds you need to make this call, and if you miss your draw you are done. Leading out wouldn't be a great idea, since there are 3 players to act behind you who may have a made hand at this point. If you were to lead out though, push. Just check and fold this hand, and wait for a better spot to push the rest of your chips in there (which will have to be done soon preflop). If the blinds were a level or two higher, and you were in this exact situation with T550, I would start thinking about calling here. You original plan to c/r a small bet was not a bad idea, but this T300 reraise is the information that should tell you not to go through with it.