I'm about to start working on my first cast 9mm load. I have a new 9mm pistol that I am going to use for this. Powder coating the bullets. The pistol has a 3.85" barrel. It has polygonal rifling. I am planning to size the bullets at 0.357", following previous recommendations to allow the barrel to "size" the bullets.
At what range (distance) do you guys use when developing a handgun load?