In another few years coal miner turned boxer turned actor Charles Bronson would have been perfect to star in this film which was almost autobiographical in his case. Like Jeff Chandler in this film, Bronson was brought up in the Pennsylvania coal mining country and took up boxing before acting as a way out of some dire poverty.
Chandler plays coal miner Coke Mason who only wants to earn enough money to start a business and get married to Evelyn Keyes. But his brother Stephen McNally sees a future in Chandler's fists and wants to manage him.
Chandler has one thing that can't be taught. He has a murderous punch and a killer instinct in the ring. Lots of fighters have that, two of the most prominent were Jack Dempsey and Rocky Graziano. In fact in that aspect this version of Iron Man is close to the Graziano film Somebody Up There Likes Me.
The main weakness in the film is there is no real explanation for why Chandler is such an animal in the ring. Especially since one of the supporting characters is Rock Hudson who is from those same mines and also becomes a boxer, but he uses skill and speed and is a fan favorite. Chandler is as unpopular as one of Vince McMahon's patented wresting villains.
It's a good boxing film, but this version of Iron Man will never rank with a film like Champion where another prize fighter has a killer instinct.