Nice Carbine!
I have a Uberti Baby RB too, and it`s the carbine that comes with me in the back pack on hikes.
It will handle any factory .357 mag ammo. I handload for mine, but only use 180 gr cast bullets and nothing in 158gr so I can`t comment on the load that you have chosen.
I have a peep sight on mine, and have discovered that the POI is way different with .38 special vs .357 mag even at a measly 25 yards.
I have just reamed the chamber to .357 maximum, and will soon work up a 180gr maximum H110 load with the chronograph. If you read my posts on this subject, you will see that I too have researched the saami CIP CUP pressures for this rifle.