There's at least one I know about. It's known as the Mundy buck from New Mexico. It was taken in 1962. It's net nontypical score is 288-6/8, and it has 51-3/8" of abnormal points, meaning its net typical frame is 237-3/8.
The Burris buck nets 226-4/8 Typical. It has 2-5/8" of abnormal points which means its typical frame is 229-1/8.
This information is from the B&C book "Records of North American Elk and Mule Deer" last published in 1996. Current owner of the Mundy buck is a Forum member here and he has posted pictures of the buck in the past. With an outside spread of 49-2/8, I think it's the most impressive buck of all time.