A professional competitor since 1997, McCully has also formerly competed for the UFC, RINGS, Pancrase, It's Showtime and Jungle Fight.

McCully trains with Team Punishment, including Tito Ortiz, Kendall Grove, and professional wrestler Samoa Joe.

He has also fought a former UFC champion, losing to Evan Tanner by technical submission at a 1998 Pancrase event.

[2] He lost by submission to Gonzaga applying an Americana keylock from the mounted position in the first round.

This fallout culminated with McCully openly supporting and training with Stephan Bonnar who was Ortiz' opponent at Bellator 131.