For what it is worth, when loading target/plinking loads for my 357's I use 5.5 to 6.0 grains of unique, Federal #100 Primers, and Rainier 158 grain plated bullet. This makes a nice mild round. Even my 11 year old Grandson handles this load without any problems in my 686. The main reason I went with the plated bullet was lead/lube fouling. I have used both Rainier and Berry Plated bullets. After a day at the range, cleanup is much faster.
When loading 38 Special Brass I cut the powder back to 4.1 to 4.6 grains.
Whatever powder/bullet combination you decide to go with ALWAYS follow the recommended powder charge established by the manufacturer. NEVER EXCEED MAXIMUN LOADS!