I have been shooting both the bullet you have and the Lee 125 grain Tumble Lube. They work just great. I size to .355 on the RCBS and leave them unsized for the Lee, they come out about 357. I also use the Tumble Lube ones as cast in 38 special.
I've been using 5 grains of Unique in the 9mm. I haven't found anything my M&P 9c doesn't like, it's a great little gun and has become my full time summer CCW.