I have 38 Special dies from Lee, Lyman, and RCBS Cowboy and all of them are stamped 38/357. I thought it curious that the OP somehow bought 357-only dies.
A second thought is that little guns, even with light loads, could generate enough recoil for crimping to be a concern, at least for me.
Next, I was reminded of Winchester's latest ammo line wherein they have one round for practice and another for self defense. I have those and like them.
Lastly, for a couple reasons I would suggest a lighter weight bullet for a small gun than 158 gr.
A second thought is that little guns, even with light loads, could generate enough recoil for crimping to be a concern, at least for me.
Next, I was reminded of Winchester's latest ammo line wherein they have one round for practice and another for self defense. I have those and like them.
Lastly, for a couple reasons I would suggest a lighter weight bullet for a small gun than 158 gr.