I like your boy a lot I have seen old photos of Pitties with that mug

I think people tend to generalize anything that is stocky or broad as Bully. Again every dog is different and you can have a liter of different body types specially if the pedigree is not tight. My bro in law has a dog that is close to 90 pounds with a 24 inch head, I am not too sure on the ped of the dog but his litermate is like 40-50 pounds and looks like a regular bully breed petbull. THe dog is an exact copy of the father and the mom looks like an apbt small size with the general characteristics. Because there is such diversity of blood in all the bull breeds in each mating you can have a throw back or something completely off. You can have dogs with American Bully pedigrees by all means but this does not mean they are the actual type being shown in the ring. My boy Bernie has a ton of Bully blood in his pedigree and has dimensions beyong the real APBT but I could never consider him a Bully, I guess I call it a Bully to people that ask me so they do not get confused but realistically speaking my dog is far from what a show Bully should look like. Also, he is not an APBT so I just call him a scatterbred Bully dog lol If his pedigree was equal from his sire and dam's side I would have had a Bully, but his Dam's sire is not Bully is just long legged dogs with thicker features but still not the real Bully. There is no mistaken when you see a real bully because it's a dog so unique in its features that well you could tell from a mile away it cannot be mistaken for an APBT. Also the second you mix in a dog with longer features right away you change the outcome. I have seen one of Bernie's brothers that practically shares the same pedigree except Bernie has a different mother, but that other dog's pedigree contains every dog in Bernie's ped and the dog is low, stocky, short limbed and wide.
Look at Bernie's dads pedigree and all the dogs in it and then look at the mom's side.
American Bully Online Pedigree