The loadbook for 357SIG is just basically pages cut out of all the bullet and powder makers books and then photocopied and assembled into a book.
Any info I could recommend (Short of online sources.) would be part of that book.
Anything specific you'd want to know would be archived here, at GT, or at TFL.
Search through the archives, I'll bet any questions you'd have would have been addressed before.
Another source is petej88's site.
A quick search will prolly net a wealth of good info.
http://www.handguninfo.com/Archive/www.Pete-357.com/
When I first started loading 357SIG, I made the mistake of just grabbing a load out of a load book, (Not saying which one!!) picked the max load with blue dot, stamped out 50 rounds and loaded 'er up.
The first shot nearly blew the gun out of my hand. I took the gun apart, and it was fine.
As a testament to my own ignorance, I figured it was a fluke, and ran a full magazine through that poor gun.
My hand stung something FIERCE. I'm not gonna quote that load for fear of someone thinking it's a great load, and wind up disassembling their appendages.
Let's just say it was a compressed load of blue dot, and leave it at that.
I have no doubt that the gun I was shooting could handle it, but the SOUND it made was horrible. With earplugs AND a set of EXCELLENT muffs on, I could STILL hear the slide forcefully hitting the end of it's travel hard enough to sting my hand.
Use common sense, there's some bad info out there.