My opinion is, you can’t have too much crimp, provided the crimp doesn’t damage the bullet or buckle the case. I measure about .010 crimp on my 44 specials, I can’t remember what the 357 mag measures. .010 is a lot, but not excessive.
I also think you can’t read too many manuals. I’ve read Lyman 45,46,47,48,49, cast bullet handbooks 1,2,3,4. RCBS cast bullet handbook, Speer 10,15, hornady 2, Sierra 2, Lee 2, ABCs of reloading, Lyman shotshell 5th, and many other smaller books and articles. And I am still reading. I have Speer 6 and 8 to work on currently. And I’m wanting the Lyman 50 and 51.
OP, sir, welcome to THR. The way I approach bullets for which I have no specific data is to determine the amount of volume that bullet occupies in the case, and find a similar or identical bullet for which data does exist. Loading 357 to 35k psi with a bullet substitution is not safe for a beginner. You should load to 38 special or +p levels to start until you find bullets and data specific to them for 357 magnum.