256 Newton case forming-my experience. It's already been shared about how a forming and trim die will make it easier. Using a FL die will work. Take a look where your 270 shoulder is to see how much is moved to make a Newton case. Dents in the case had to do with Imperial wax collecting in the neck and shoulder portion of the die. It was necessary to keep the FL wiped out. This minimized dents. Slowing up pass in the press when forming cases may minimize the collapsed necks. If you have a wrinkle in the shoulder toss the case. Use good clean annealed brass for forming. I was using CH dies in a RC II press.
