I have the Thunderbolt rifle, but I've only shot it on 3 occasions, since it's a pain to load. They adhered to the original design from Colt, which is from the late 1800's, so it's not a real strong system.
Mine has fed everything I've put in it, including .38 Special SWC, on up to 180 grain RNFP .357 Magnum. As rc noted, there is ample data for 200 grain bullets in the .357 Magnum.
My suggestion would be to limit use of .358" diameter bullets to cast bullets, which is the preferred diameter anyway for shooting cast in the .357 Magnum.
I don't know if you bought the blue rifle or the stainless, but on my stainless, the screws on the blast shield work loose after just 10 rounds. I put some LocTite on them, and I'll see if they stay in place the next time I take it to the range.
Like I mentioned, this is a very old action, and Taurus pretty much stayed with the original design, which is why you can slam fire it if you're not careful. Don't hold the trigger back while working the pump, or it will go off each time the action is cycled..........
Hope this helps.
Fred