This one is 22 oz, virtually the same weight as my steel frame 640, so I wouldn't refer to it as lightweight. The website shows it with "Ultra-Lite" stamped on the side, but mine doesn't have that rollmark. They probably took it off because it was misleading, making it look like an alloy frame.

The current online revolver manual says:

Only fire SAAMI rated Plus P (“+P”) ammunition in Taurus Models designated by Taurus
for +P use. Firing +P ammunition in other Taurus products may be dangerous and can
result in serious bodily injury or death. Those Models are:
Model 85 small frame revolver in 38 Special.
Model 850 small frame revolver in 38 Special.
Model 851 small frame revolver in 38 Special.
Model 85 Polymer small frame revolver in 38 Special.
Model 82 medium frame revolver in 38 Special.
Model 817 medium frame revolver in 38 Special.
All firearms chambered in 38 Super Automatic.
All firearms chambered in 45 Automatic. (ACP)
All firearms chambered in 9mm Luger.

I left the 856 manual in the car, I'll check it tomorrow.