Start from the perceived point of impact and work your way out. Gut shot deer will leave traces and even pools of brownish clear bile liquid, so keep an eye open for that(if its not too late). If you didn't push him, he wont be too far. I had a gut shot deer live for almost 24 hours last year. I found him 2 days after I shot him and 1 day after I last saw him alive and backed out. He was approx. 125yds from where I originally shot him and 50yds from where i last saw him alive.