Yeah I know. H110 and a 125 grain pill eroded my forcing cone bad. I'm trying to make mid range 357My reloading manuals are a bit out-dated, but I see 10.0 grains of Unique as "Maximum" for a 110 grain jacketed bullet, 9.7gr for the 125g.
If you really want more power/velocity in your 125g loads, perhaps w296/H110, even Longshot, would be a better powder choice.
You're really consuming the powder with W296/H110 (22.0 gr), but these will give you magnum velocities ~1966 fps.
9.7gr of Longshot lists 1647 fps.
(all date per Hodgdon, 10" bbl)