Love Life. it makes no difference.
The 357Sig round has a very short neck on the case. when loading these I put the nose of the bullet against the bench and try to push the bullet back into the case. If the bullet moves, There isn't enough crimp. I adjust the crimp to suit.
I have loaded some lee 358 125gr RNFP sized to .356 caoted in the new bright red/maroon coating in to resized 40 S&W cases made into 357Sig cases and will be firing them tomorrow. these red/maroon bullets look HOT!!!!!!