I used a Datacolor Spyder 4 Elite on a Optoma GT750E.
The projector is set to default settings except lamp is in bright mode. I calibrated to gamma of 2.2 and 6500K. After calibration the software told me I have 84% of sRGB range. That sounds really bad, but I am projecting onto a white wall not a projector screen, expect much better results with a good screen.
Note that Optoma has the GT760 out now which has much better contrast.