Re: 38 Special cutdown to 38 S&W
Here's your problem. If you cut 38 Special brass down to 38 S&W length, your Special seating die's crimp shoulder will not be low enough to crimp it.
Do you, by chance, also have 9mm dies? If so, you can crimp it with a 9mm seating die. 380 will work, for that matter.
A cut-down 38 special case will work in a 38 S&W chamber. Your case life will be short, as there will be much expansion when fired, and then resizing too small, giving you, again, much expansion when fired. I doubt you'd get more than two - maybe three loadings out of it before you got cracks.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.