I agree with the others. It sounds like you may be either too close to the bedding area (in it), or not taking enough care with your approach. You said that there was one and only one way into this stand and with a buck of that caliber he is either able to see or smell you approaching.

I would either move that stand using the information now available toa spot that you can access without blowing out the deer or find a new approach to the stand that doesn't blow out the deer.