Yes, I am aware of that, but rated and capable are two different things.
I don't know if the 637 is capable, though a few people have done it before and claim success.
The .357 titanium cylinder is capable, it is the top strap on the frame that concerns me. It would appear that the addition of 0.05% to 0.15% scandium to the aluminum alloy increases the frame strength by about 35%.