I have some notes on which specific guns at specific "weight classes" can be expected to cope with what class of ammo, across the 38Spl/357Mag spectrum on page 11 of the "revolver checkout":
http://tinyurl.com/revocheck
I consider the 17oz Ruger LCR357 to be the lightest 357 worth owning, and even then it's going to be limited in power. There are mild 357 rounds that will be in the same horsepower range as the best 9mm and even some 9mm+P loads from a full-size gun, but shot from a 2" snubby 357 wheelgun. In other words, this class of gun can cope with 350ft/lbs energy pretty easily, 400-450 at a stretch.
The SP101 at 26oz is the lightest "real" 357 made today, and even there the wildest ammo made will be a severe handful. If you want to explore the outer edge of the "real" 357 loads the GP100 at 39oz (4" variant) or it's equivalent in S&W-land (L-frame 586/686/etc.) is the right place to start - but if it's not clear, I'm talking about monster loads well into the 10mm power range with about 800ft/lbs energy on tap and not everybody needs to go there. An SP101 with a 3" barrel can still cope with rounds of about 550ft/lbs energy in experienced hands - which is hotter than the 45ACP and about on par with the best 40S&W loads.
Put another way, looking at the "357" as one caliber is really not accurate any more.