My Bushmaster has only failed me with one brand of ammo. China Sports, I don't remember if it's one word or two, but it was trash. My Sig and the Bushmaster refused to fully chamber the China junk. A Beretta and a 9mm 1911 ran smooth with it though.
I checked the dimensions and they were all in spec, but like I said, it didn't work. There was also an issue of over pressure. The primers didn't set back on firing, but they did flatten out against the bolt face
(there was no impact mark from the firing pin in the primer).