I think he would be about 320ish if he was 6x6 so probably will gross 310-315. Looks pretty wide, although at the angle of the photo that's just a guess. Nice bull for sure - I wouldn't hesitate for a second on an OTC tag!
I would put him right in there! I Hunted a 328 5x6 this year for a week then shot a smaller bull and my hunting partner killed him 2 days later- I had pictures on my old phone but have a new one now or I would post them for comparison but there is a huge difference. Not to say that this bull isn't a great bull I would take him any day!