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Reloading confusion.

Hi,
I finally upgraded from a single stage press to a Dillon RL550b and also got Dillon .357 Sig dies. I have a few thousand once fired .357 Sig brass and since it is my first time reloading a bottleneck pistol caliber, I'm a bit confused.

Ok, here are my questions...
Do I have to lube the cases?
Do I have to adjust the headspace, like on a rifle?
Do I have to trim the cases?

Any help is appreciated.
Have a nice day 🙂

Lube-yes, lightly, but yes.

Headspace- yes. Use either your barrel or a headspace case gage to properly adjust the size die, to ensure cartridges fully chamber.

Trim- no. It has never proven to be a problem.

One way to avoid using lube is to size the cartridge with a 0.40 caliber die first.  That way the lube won't be necessary.  I have loaded this cartridge this way for a while now with success.

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