What powder weight are you using?My 28" 8.5tw PacNor .20-.223AI pushes the 55 grain Berger to 3640 fps using RL17. The formed cases hold 32.4 grains of H2O and should be close to the 204R.
My 28" 8.5tw PacNor .20-.223AI pushes the 55 grain Berger to 3640 fps using RL17. The formed cases hold 32.4 grains of H2O and should be close to the 204R.