Might want to remember that true SC'ers are partial rep movements. Not meant to have the bar lower, as behind the head or anywhere else, only touching from the bridge of the nose to the upper forehead. Elbows will be out, for this is not a strict movement by any means. Might even be pushing off reaching the top part of the exercise, as some do. Some men consider it a power exercise. Seeing as how 200+ is not that unusual in a lot of power gyms, I can understand this. Seen 300+ for workout reps. Guy's were mostly big benchers.
There is also the DB version, one arm at a time, with even a shorter ROM. Also seen big benchers favor these.The pec's are involved to help keep the arms stable, as are the shoulders and back (lats). Might be a slight gain in pec growth but that would be all. Anyone feel the need of a spotter, than get one. Most guy's just flip the bar back, behind the head, if a problem arises.
True SC'ers are not meant for most trainee's. The average elbow will not take that stress. So applying a little caution when doing this exercise may be needed. Using wraps or rubbing lotion to keep the area warm, with a good blood flow, may help. If suited for you than it can be a great muscle builder and even help strengthen the elbow tendons & ligaments. Though there are limits to everything. Good Luck.