I’m interested in developing some low velocity/pressure loads using pistol powders in 223 & 7.62x39. Something that would be useful as a small game load that wouldn’t require the burden of a second rifle while afield. I’ve read that brass used for such loads should be kept separate from brass used for full power loads. I’m not clear on exactly why. Would using fire formed and neck sized brass remedy the situation? Any information provided would be greatly appreciated.