These days I use these dies for .38 Spl and .357 Mag. I use the sizer for both, with separate expanders. I use the same seater for both. I use the thin spacers for adjusting the amount of crimp. The crimpers are set for medium or heavy, and I use the spacers for anything lighter.
The only dies I have experience with is RCBS which are labeled 38/357. The only issue I could see running into with with .357 in a truly 38 specific die is not being able to run it far enough down to size it's full length without crunching the mouth.
As Evan stated, the Lee die sets for 38 Special easily process both 38 Special and 357 Magnum (what i've used for several years). I will dedicate my Lee 357 Magnum dies for loading 357 Remington Maximum for my T/C Encore rifle. I purchased a tapered bullet seating plug for loading the Hornady 180 gr SSP bullet in that caliber.
I have and use the Lee 38/357 dies a long time. I also bought a second set and turret so I don't need to adjust anything. Be careful though, Lee has a 38/357 die set and a dedicated .357 Magnum die set. As said above, you can load 357 ammo in a 38 die set but usually not 38's in 357 dies.
From the Lee Site:
Note: you may use the 38 Special die set to reload for the 357 Mag. You would have to back out the Powder Thru Expander Die, and the Bullet Seating and Crimping Die about 2 turns to compensate for the longer 357 case.
There are .357 only die sets, and are marketed as such, but the majority of die sets are marked .38 Spl/.357, or are at least advertised as such, since they will load both. All the die makers sell such a set.
For me, the Lee carbide dies are so inexpensive, I just bought a set for each....problem solved. I just used a black permanent marker to tell them apart.
Knowing myself, if I tried to use one for both, I'd screw it up!
I used to use my Lee .38/357 dies for both, but since i started using a progressive press for pistol calibers i bought a Lyman 4 die set that is stamped .38 spcl 357 mag 357 max. and i now use those for .357's.
I use the deluxe die set from Lee. The .38 Spcl dies will work on the .357 Mag but not the other way around. Seating die and expander die need to be adjusted for the .357.
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