I had no leading problems with the RB load. And its about like a standard 22 load from a rifle barrel for noise. If shooting the 9mm load from a rifle make sure its making it out of the barrel with plenty of force. Or maybe better raise the load to 3.5grs of Bullseye.
I loaded the RB load in a 357 case with the bullet slightly showing and added a little Lee alox around the edge of the bullet and no leading. Plus they would cycle from the magazine. A 38 case wouldn't.
I had a Marlin 32 mag I just sold and had some 1.2gr Bullseye loads with a 76gr lead bullet and they were as quiet as a CB22 round but still went 960fps on the Chronograph. What a great poacher deer round they would have been if I were inclined that way.