It doesn't look like a camera problem, rather a case of the edge not being evenly developed and something touching the film.

Steel reels shouldn't do this, the only thing I can think of off the top of my head is are you winding the film onto the reel emulsion side in, or emulsion side out? If emulsion side out the emulsion will be in contact with the reel, emulsion side in less so. But looking more closely I can see some streaking from the spots that runs across the film, so perhaps contamination?

Steve