I have a Dillon 550 and an RCBS single stage press. When reloading .357 Sig I use a carbide .40 cal die and size the case with that in the RCBS single stage press. Then I run the .357 Sig die in station one of the 550 and go on as normal neck sizing only. My .357 Sig die set is Lee and made in 2007 I think. Also I turn the locking nut upside down to compensate for the short Lee die. This system seems to work well for me.