Just a piece of advice. Considering you loaded .40SW and didn't kill yourself or anyone else you at least have some knowledge (not enough but some). The key to .357 SIG is all about bullet/case tension. It is the one thing people have issues with (who already know what they are doing). I would get a couple reloading Manuals. Read them. What kind of press you using? Maybe someone will know about the instructions you have and how complete they are compared to a real manual.