For the most part my experience has been that in bullet weights 115gr & above flat pointed (i.e., Berrys HBFN-TP for practice/range use) or hollow pointed bullets (i.e., XTP, Gold Dot for HD/PD) work best for 357 SIG because the recommended OAL is typically 1.135" (1.140" for 147gr).

Round nosed or conical bullets don't always allow enough of the bullet past the ogive (some refer to it as the caliber diameter) to secure within the case. Pushback can also be a factor with 357 SIG velocities: I use the LEE FCD which is a collet-style crimp die (often used with bottleneck rifle cartridges) with much confidence.

If you take a look at the profiles of bullets specifically designated as being for 357 SIG I think you will notice their similarities.

There are other posts on this sub-forum about dies you may find instructional as well.

Cheers!