All of the above applies.
I have a good stockpile of factory .40 for the Sig. Even if I didn't, if there are two cartridges I've figured out how to load for, it's 9mm and .40. I've experimented with different primers, bullet weights, lead bullets, jacketed bullets, and found the bottom and top of the powder charges for each, at least with Win231. I've got my own data in addition to book recipes about how fast I can push a certain bullet without it destabilizing, without the primer flattening, etc.
But those plated bullets annoyed me the first time I loaded them, and the second box has been sitting under the bench for over a year. Time to get rid of them.