Hey Ship,
If this does ever happen- cuz you never know, I have you covered. I have over 5k in spent cases and have three extra sets of dies. I can provide you with a detailed step by step process to reloading the 5.7
and Yes, if you just want to buy a set of dies just in case for the future... go to the place you said...Midwayusa, look for either the Hornady die set or the RCBS 5.7 FL Die set for around $30.
Wil