As my first post I would like to say hello to everyone.
I have some questions I am needing answers to.
I would like to start reloading 357sig but I have some questions and am not sure where to start.
First, I am looking into buying a dillon 650 setup and will be reloading 357sig only to start. Are Dillon dies a good die to start with? With these dies is case lube necessary seeing as they are carbide. What bullet do most use for this caliber, a 357sig specific bullet or 9mm? I have read that some reloaders are having trouble getting the cases to resize fully and are having to mill their dies to compensate, are these still issues or have the dies gotten better? What is the best way to get the right amount of tension on the neck in order to prevent setback? What is the difference between roll crimping and taper crimping?
Thanks in advance.

First of all, welcome to the forum!

As far as dies go Dillon, RCBS, and Hornady all make fine equipment (as well as a few others, but I tend not to use them). The bullets are the same for both the 9mm and the 357 SiG except I think you can find some heavier ones designed specifically for the SiG. I like the 125 Gr. Gold Dot and I have a 125 Gr. .355 RN mold for casts.

I personally haven't had any problems with my RCBS dies not resizing properly so I don't know what to tell you there.

With the crimp though, your going to want to have a taper crimp. I'm not even sure if you can get a roll crimp and I'm too lazy to get up and look right now. From everything I've read the 357 SiG headspaces on the mouth, not the shoulder. I'm still not sure if I believe that though because going against all the warnings I've recieved I tried forming 40 S&W and they seem to work fine out of my Sig 239 despite being about .020" too short.

Hope this helps a little.

mbahr22250