None of that is needed, but to silence it you'll need a silencer. Theres no way around that. All this is doing is using a heavy bullet at a slower speed. Powders and charges will vary. You'll jsut need to keep it under 1080 FPS to keep it subsonic. Id say about 1060 fps to be safe and allow for your ES to still stay under sub sonic velocities. All you should need is powder, bullets and a seater die to do this in your press.